Carl S

I should have been more specific. 4.56 gears turning 33" tires will restore
stock performance. The lil bit of extra gear makes up for extra wind
resistance, tire wieght, ect.

Carl

"c" <c@me.org> wrote in message
news:46f4725b$0$9561$4c368faf@roadrunner.com...
> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
> I quote "4.56 is as close as it gets to how it was stock". I was wrong
> because I had the wrong original tire size. But even at that my
> calculations are much closer than saying that 4.56 gears would be as close
> to stock as her original setup.
>
>
> Mike Romain wrote:
>> She had 215's....
>>
>> You are wrong.
>>
>> Mike
>>
>> c wrote:
>>> I'm not disputing that those gear ratios would work the best, but you
>>> stated that they would be closest to stock, and that is simply not true.
>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>> and nothing more.
>>>
>>> Chris
>>>
>>> Carl S wrote:
>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>> 33's and 4.88 for 35's.
>>>>
>>>> Carl
>>>>
>>>>
>>>> "c" <c@me.org> wrote in message
>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>> achieve the same RPM as original.
>>>>>
>>>>> for 31s it would be 3.26
>>>>> for 33s it would be 3.49
>>>>>
>>>>> Chris
>>>>>
>>>>> Carl S wrote:
>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>
>>>>>> Carl
>>>>>>
>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>
>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>> or
>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>> goal
>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>> bone
>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>> please
>>>>>>> help! : D
>>>>>>>
>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>> 6 speed manual
>>>>>>> Dana 30 front/35 rear
>>>>>>> current 3.07s
>>>>>>>
>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>> (like
>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>> gear
>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>> a
>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>
>>>>

Carl S

I should have been more specific. 4.56 gears turning 33" tires will restore
stock performance. The lil bit of extra gear makes up for extra wind
resistance, tire wieght, ect.

Carl

"c" <c@me.org> wrote in message
news:46f4725b$0$9561$4c368faf@roadrunner.com...
> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
> I quote "4.56 is as close as it gets to how it was stock". I was wrong
> because I had the wrong original tire size. But even at that my
> calculations are much closer than saying that 4.56 gears would be as close
> to stock as her original setup.
>
>
> Mike Romain wrote:
>> She had 215's....
>>
>> You are wrong.
>>
>> Mike
>>
>> c wrote:
>>> I'm not disputing that those gear ratios would work the best, but you
>>> stated that they would be closest to stock, and that is simply not true.
>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>> and nothing more.
>>>
>>> Chris
>>>
>>> Carl S wrote:
>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>> 33's and 4.88 for 35's.
>>>>
>>>> Carl
>>>>
>>>>
>>>> "c" <c@me.org> wrote in message
>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>> achieve the same RPM as original.
>>>>>
>>>>> for 31s it would be 3.26
>>>>> for 33s it would be 3.49
>>>>>
>>>>> Chris
>>>>>
>>>>> Carl S wrote:
>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>
>>>>>> Carl
>>>>>>
>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>
>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>> or
>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>> goal
>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>> bone
>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>> please
>>>>>>> help! : D
>>>>>>>
>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>> 6 speed manual
>>>>>>> Dana 30 front/35 rear
>>>>>>> current 3.07s
>>>>>>>
>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>> (like
>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>> gear
>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>> a
>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>
>>>>

Carl S

I should have been more specific. 4.56 gears turning 33" tires will restore
stock performance. The lil bit of extra gear makes up for extra wind
resistance, tire wieght, ect.

Carl

"c" <c@me.org> wrote in message
news:46f4725b$0$9561$4c368faf@roadrunner.com...
> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
> I quote "4.56 is as close as it gets to how it was stock". I was wrong
> because I had the wrong original tire size. But even at that my
> calculations are much closer than saying that 4.56 gears would be as close
> to stock as her original setup.
>
>
> Mike Romain wrote:
>> She had 215's....
>>
>> You are wrong.
>>
>> Mike
>>
>> c wrote:
>>> I'm not disputing that those gear ratios would work the best, but you
>>> stated that they would be closest to stock, and that is simply not true.
>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>> and nothing more.
>>>
>>> Chris
>>>
>>> Carl S wrote:
>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>> 33's and 4.88 for 35's.
>>>>
>>>> Carl
>>>>
>>>>
>>>> "c" <c@me.org> wrote in message
>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>> achieve the same RPM as original.
>>>>>
>>>>> for 31s it would be 3.26
>>>>> for 33s it would be 3.49
>>>>>
>>>>> Chris
>>>>>
>>>>> Carl S wrote:
>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>
>>>>>> Carl
>>>>>>
>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>
>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>> or
>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>> goal
>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>> bone
>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>> please
>>>>>>> help! : D
>>>>>>>
>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>> 6 speed manual
>>>>>>> Dana 30 front/35 rear
>>>>>>> current 3.07s
>>>>>>>
>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>> (like
>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>> gear
>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>> a
>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>
>>>>

c

Fair enough. I wasn't trying to start crap or anything, I just want to
make sure that Tracie gets accurate information. A gear swap is not
something you want to mess up on and have to do twice. For as much as
she drives on the highway, I would personally lean toward the 4.11s. It
might be a good idea for her to run at 2200RPM or so on the highway to
see how it affects her fuel mileage. I don't think it will change
drastically though.

Here are the comparisons for 4.11 vs. 4.56 at 60mph:

4.11 with 31" tires = 2250 RPM
4.11 with 33" tires = 2100 RPM
4.56 with 31" tires = 2450 RPM
4.56 with 33" tires = 2325 RPM

Chris


Carl S wrote:
> I should have been more specific. 4.56 gears turning 33" tires will restore
> stock performance. The lil bit of extra gear makes up for extra wind
> resistance, tire wieght, ect.
>
> Carl
>
> "c" <c@me.org> wrote in message
> news:46f4725b$0$9561$4c368faf@roadrunner.com...
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
>> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
>> I quote "4.56 is as close as it gets to how it was stock". I was wrong
>> because I had the wrong original tire size. But even at that my
>> calculations are much closer than saying that 4.56 gears would be as close
>> to stock as her original setup.
>>
>>
>> Mike Romain wrote:
>>> She had 215's....
>>>
>>> You are wrong.
>>>
>>> Mike
>>>
>>> c wrote:
>>>> I'm not disputing that those gear ratios would work the best, but you
>>>> stated that they would be closest to stock, and that is simply not true.
>>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>>> and nothing more.
>>>>
>>>> Chris
>>>>
>>>> Carl S wrote:
>>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>>> 33's and 4.88 for 35's.
>>>>>
>>>>> Carl
>>>>>
>>>>>
>>>>> "c" <c@me.org> wrote in message
>>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>>> achieve the same RPM as original.
>>>>>>
>>>>>> for 31s it would be 3.26
>>>>>> for 33s it would be 3.49
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>> Carl S wrote:
>>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>>
>>>>>>> Carl
>>>>>>>
>>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>>
>>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>>> or
>>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>>> goal
>>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>>> bone
>>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>>> please
>>>>>>>> help! : D
>>>>>>>>
>>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>>> 6 speed manual
>>>>>>>> Dana 30 front/35 rear
>>>>>>>> current 3.07s
>>>>>>>>
>>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>>> (like
>>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>>> gear
>>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>>> a
>>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>>
>
>

c

Fair enough. I wasn't trying to start crap or anything, I just want to
make sure that Tracie gets accurate information. A gear swap is not
something you want to mess up on and have to do twice. For as much as
she drives on the highway, I would personally lean toward the 4.11s. It
might be a good idea for her to run at 2200RPM or so on the highway to
see how it affects her fuel mileage. I don't think it will change
drastically though.

Here are the comparisons for 4.11 vs. 4.56 at 60mph:

4.11 with 31" tires = 2250 RPM
4.11 with 33" tires = 2100 RPM
4.56 with 31" tires = 2450 RPM
4.56 with 33" tires = 2325 RPM

Chris


Carl S wrote:
> I should have been more specific. 4.56 gears turning 33" tires will restore
> stock performance. The lil bit of extra gear makes up for extra wind
> resistance, tire wieght, ect.
>
> Carl
>
> "c" <c@me.org> wrote in message
> news:46f4725b$0$9561$4c368faf@roadrunner.com...
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
>> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
>> I quote "4.56 is as close as it gets to how it was stock". I was wrong
>> because I had the wrong original tire size. But even at that my
>> calculations are much closer than saying that 4.56 gears would be as close
>> to stock as her original setup.
>>
>>
>> Mike Romain wrote:
>>> She had 215's....
>>>
>>> You are wrong.
>>>
>>> Mike
>>>
>>> c wrote:
>>>> I'm not disputing that those gear ratios would work the best, but you
>>>> stated that they would be closest to stock, and that is simply not true.
>>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>>> and nothing more.
>>>>
>>>> Chris
>>>>
>>>> Carl S wrote:
>>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>>> 33's and 4.88 for 35's.
>>>>>
>>>>> Carl
>>>>>
>>>>>
>>>>> "c" <c@me.org> wrote in message
>>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>>> achieve the same RPM as original.
>>>>>>
>>>>>> for 31s it would be 3.26
>>>>>> for 33s it would be 3.49
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>> Carl S wrote:
>>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>>
>>>>>>> Carl
>>>>>>>
>>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>>
>>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>>> or
>>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>>> goal
>>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>>> bone
>>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>>> please
>>>>>>>> help! : D
>>>>>>>>
>>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>>> 6 speed manual
>>>>>>>> Dana 30 front/35 rear
>>>>>>>> current 3.07s
>>>>>>>>
>>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>>> (like
>>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>>> gear
>>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>>> a
>>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>>
>
>

c

Fair enough. I wasn't trying to start crap or anything, I just want to
make sure that Tracie gets accurate information. A gear swap is not
something you want to mess up on and have to do twice. For as much as
she drives on the highway, I would personally lean toward the 4.11s. It
might be a good idea for her to run at 2200RPM or so on the highway to
see how it affects her fuel mileage. I don't think it will change
drastically though.

Here are the comparisons for 4.11 vs. 4.56 at 60mph:

4.11 with 31" tires = 2250 RPM
4.11 with 33" tires = 2100 RPM
4.56 with 31" tires = 2450 RPM
4.56 with 33" tires = 2325 RPM

Chris


Carl S wrote:
> I should have been more specific. 4.56 gears turning 33" tires will restore
> stock performance. The lil bit of extra gear makes up for extra wind
> resistance, tire wieght, ect.
>
> Carl
>
> "c" <c@me.org> wrote in message
> news:46f4725b$0$9561$4c368faf@roadrunner.com...
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
>> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
>> I quote "4.56 is as close as it gets to how it was stock". I was wrong
>> because I had the wrong original tire size. But even at that my
>> calculations are much closer than saying that 4.56 gears would be as close
>> to stock as her original setup.
>>
>>
>> Mike Romain wrote:
>>> She had 215's....
>>>
>>> You are wrong.
>>>
>>> Mike
>>>
>>> c wrote:
>>>> I'm not disputing that those gear ratios would work the best, but you
>>>> stated that they would be closest to stock, and that is simply not true.
>>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>>> and nothing more.
>>>>
>>>> Chris
>>>>
>>>> Carl S wrote:
>>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>>> 33's and 4.88 for 35's.
>>>>>
>>>>> Carl
>>>>>
>>>>>
>>>>> "c" <c@me.org> wrote in message
>>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>>> achieve the same RPM as original.
>>>>>>
>>>>>> for 31s it would be 3.26
>>>>>> for 33s it would be 3.49
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>> Carl S wrote:
>>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>>
>>>>>>> Carl
>>>>>>>
>>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>>
>>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>>> or
>>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>>> goal
>>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>>> bone
>>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>>> please
>>>>>>>> help! : D
>>>>>>>>
>>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>>> 6 speed manual
>>>>>>>> Dana 30 front/35 rear
>>>>>>>> current 3.07s
>>>>>>>>
>>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>>> (like
>>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>>> gear
>>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>>> a
>>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>>
>
>

c

Fair enough. I wasn't trying to start crap or anything, I just want to
make sure that Tracie gets accurate information. A gear swap is not
something you want to mess up on and have to do twice. For as much as
she drives on the highway, I would personally lean toward the 4.11s. It
might be a good idea for her to run at 2200RPM or so on the highway to
see how it affects her fuel mileage. I don't think it will change
drastically though.

Here are the comparisons for 4.11 vs. 4.56 at 60mph:

4.11 with 31" tires = 2250 RPM
4.11 with 33" tires = 2100 RPM
4.56 with 31" tires = 2450 RPM
4.56 with 33" tires = 2325 RPM

Chris


Carl S wrote:
> I should have been more specific. 4.56 gears turning 33" tires will restore
> stock performance. The lil bit of extra gear makes up for extra wind
> resistance, tire wieght, ect.
>
> Carl
>
> "c" <c@me.org> wrote in message
> news:46f4725b$0$9561$4c368faf@roadrunner.com...
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with 3.67
>> gears. This is HARDLY the same as the 4.56 gears that Carl said were, and
>> I quote "4.56 is as close as it gets to how it was stock". I was wrong
>> because I had the wrong original tire size. But even at that my
>> calculations are much closer than saying that 4.56 gears would be as close
>> to stock as her original setup.
>>
>>
>> Mike Romain wrote:
>>> She had 215's....
>>>
>>> You are wrong.
>>>
>>> Mike
>>>
>>> c wrote:
>>>> I'm not disputing that those gear ratios would work the best, but you
>>>> stated that they would be closest to stock, and that is simply not true.
>>>> It is a simple mathematical equation to calculate the proper gear ratio,
>>>> and nothing more.
>>>>
>>>> Chris
>>>>
>>>> Carl S wrote:
>>>>> Sorry, but it's widely held that 4.10 is correct for 31/32, 4.56 is for
>>>>> 33's and 4.88 for 35's.
>>>>>
>>>>> Carl
>>>>>
>>>>>
>>>>> "c" <c@me.org> wrote in message
>>>>> news:46f41cce$0$11026$4c368faf@roadrunner.com...
>>>>>> Sorry, but that is incorrect. Her original gear ratio is 3.07 and her
>>>>>> tires were 29". It's s simple ratio between the tire diameter and gear
>>>>>> ratio to maintain the same RPM. 29/3.07=9.45. If she maintains that
>>>>>> same ratio between tire diameter and gear ratio, her RPM will remain
>>>>>> the same. To calculate the gear ratio, she just needs to divide the
>>>>>> tire diameter by 9.45 to get the proper gear ratio if she wants to
>>>>>> achieve the same RPM as original.
>>>>>>
>>>>>> for 31s it would be 3.26
>>>>>> for 33s it would be 3.49
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>> Carl S wrote:
>>>>>>> 4.56 is as close as it gets to how it was stock.
>>>>>>>
>>>>>>> Carl
>>>>>>>
>>>>>>> "Tracie" <brainart@upstate.edu> wrote in message
>>>>>>> news:1190386700.755334.108510@19g2000hsx.googlegro ups.com...
>>>>>>>> I have posted this once today, but for some reason it did not post.
>>>>>>>> If anyone finds it, sorry for the duplicate post.
>>>>>>>>
>>>>>>>> Anyhoo, I definitely want to re-gear but I am not sure if the 3.73
>>>>>>>> or
>>>>>>>> the 4.11 ratio would be better for me. I currently have 31" BFG All
>>>>>>>> Terrain T/A KOs, but will definitely upgrade to a 33" tire of some
>>>>>>>> sort in the future when these wear out. I will never upgrade to
>>>>>>>> bigger than a 33" tire. As for off-roading, I do some light trail
>>>>>>>> riding and the occasional hop in the mud puddle when I find one that
>>>>>>>> looks fun. 80% of my driving is highway at approximately 70 miles
>>>>>>>> round trip at a speed of anywhere from 60-70 mph. The other 20% is
>>>>>>>> split between city driving (10%), and off-roading (10%). My main
>>>>>>>> goal
>>>>>>>> is to get my Jeep to drive as close as possible to the way it did
>>>>>>>> bone
>>>>>>>> stock (being able to use my 6th gear on the freeway) and to prevent
>>>>>>>> excessive wear and tear on my clutch and engine parts. Someone
>>>>>>>> please
>>>>>>>> help! : D
>>>>>>>>
>>>>>>>> '06 TJ (4.0L with I-6)
>>>>>>>> 6 speed manual
>>>>>>>> Dana 30 front/35 rear
>>>>>>>> current 3.07s
>>>>>>>>
>>>>>>>> P.S. Would I also need to upgrade my Dana 30/35 to a bigger one
>>>>>>>> (like
>>>>>>>> 44s)? I don't know if this makes any difference as far as which
>>>>>>>> gear
>>>>>>>> ratio to go with, but where I live (upstate NY), there can be quite
>>>>>>>> a
>>>>>>>> bit of snow from Dec. - Apr.
>>>>>>>>
>
>

Will Honea

c wrote:

> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
> were, and I quote "4.56 is as close as it gets to how it was stock". I
> was wrong because I had the wrong original tire size. But even at that
> my calculations are much closer than saying that 4.56 gears would be as
> close to stock as her original setup.
>

Only problem with your math is that your assumptions are off a little. The
tire circumference is accounted for but the mass distribution is off
significantly for power calculations - those 33's will take significantly
more power to accelerate (or to stop, for that matter - first hard stop
with stock brakes is a real eye-opener!) and they have way more exposed
surface area for drag. Both are significant when addressing highway
performance. A simple multiple will NOT restore the feel.

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Will Honea

c wrote:

> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
> were, and I quote "4.56 is as close as it gets to how it was stock". I
> was wrong because I had the wrong original tire size. But even at that
> my calculations are much closer than saying that 4.56 gears would be as
> close to stock as her original setup.
>

Only problem with your math is that your assumptions are off a little. The
tire circumference is accounted for but the mass distribution is off
significantly for power calculations - those 33's will take significantly
more power to accelerate (or to stop, for that matter - first hard stop
with stock brakes is a real eye-opener!) and they have way more exposed
surface area for drag. Both are significant when addressing highway
performance. A simple multiple will NOT restore the feel.

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Will Honea

c wrote:

> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
> were, and I quote "4.56 is as close as it gets to how it was stock". I
> was wrong because I had the wrong original tire size. But even at that
> my calculations are much closer than saying that 4.56 gears would be as
> close to stock as her original setup.
>

Only problem with your math is that your assumptions are off a little. The
tire circumference is accounted for but the mass distribution is off
significantly for power calculations - those 33's will take significantly
more power to accelerate (or to stop, for that matter - first hard stop
with stock brakes is a real eye-opener!) and they have way more exposed
surface area for drag. Both are significant when addressing highway
performance. A simple multiple will NOT restore the feel.

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com