RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

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.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 11:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

Hi Tracie

I currently have 33' Dunlop Mud Rovers with 3.73 gears on my YJ. When
I went to 3.73 I was running 31" tires and the jeep performed well
both on and off road. When I went to the 33's I found that I really
needed 4:10/4.11. Best bet is to only do it once.

As far as axles go, your D30 in the front should be OK as long as you
are careful. There are a couple of people in my club who run 33"
tires on D35 rears (at 3.73) without any problems, but they are mostly
experienced drivers who are very careful, don't spin tires, and avoid
bouncing. I have had to help change axle shafts for other, less
experienced folks in the club who have locked 33s on locked D35s.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 11:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

Hi Tracie

I currently have 33' Dunlop Mud Rovers with 3.73 gears on my YJ. When
I went to 3.73 I was running 31" tires and the jeep performed well
both on and off road. When I went to the 33's I found that I really
needed 4:10/4.11. Best bet is to only do it once.

As far as axles go, your D30 in the front should be OK as long as you
are careful. There are a couple of people in my club who run 33"
tires on D35 rears (at 3.73) without any problems, but they are mostly
experienced drivers who are very careful, don't spin tires, and avoid
bouncing. I have had to help change axle shafts for other, less
experienced folks in the club who have locked 33s on locked D35s.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 11:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

Hi Tracie

I currently have 33' Dunlop Mud Rovers with 3.73 gears on my YJ. When
I went to 3.73 I was running 31" tires and the jeep performed well
both on and off road. When I went to the 33's I found that I really
needed 4:10/4.11. Best bet is to only do it once.

As far as axles go, your D30 in the front should be OK as long as you
are careful. There are a couple of people in my club who run 33"
tires on D35 rears (at 3.73) without any problems, but they are mostly
experienced drivers who are very careful, don't spin tires, and avoid
bouncing. I have had to help change axle shafts for other, less
experienced folks in the club who have locked 33s on locked D35s.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 11:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

Hi Tracie

I currently have 33' Dunlop Mud Rovers with 3.73 gears on my YJ. When
I went to 3.73 I was running 31" tires and the jeep performed well
both on and off road. When I went to the 33's I found that I really
needed 4:10/4.11. Best bet is to only do it once.

As far as axles go, your D30 in the front should be OK as long as you
are careful. There are a couple of people in my club who run 33"
tires on D35 rears (at 3.73) without any problems, but they are mostly
experienced drivers who are very careful, don't spin tires, and avoid
bouncing. I have had to help change axle shafts for other, less
experienced folks in the club who have locked 33s on locked D35s.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 10:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

If you want it too run like it does now the ideal gear ration would be
3.07*33/31 = 3.27 rounded up to what is available. 3.55 seems to be
available. The 3.73 or 4.1 would give you better performance off road
but your fuel economy would suffer on the road.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 10:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

If you want it too run like it does now the ideal gear ration would be
3.07*33/31 = 3.27 rounded up to what is available. 3.55 seems to be
available. The 3.73 or 4.1 would give you better performance off road
but your fuel economy would suffer on the road.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 10:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

If you want it too run like it does now the ideal gear ration would be
3.07*33/31 = 3.27 rounded up to what is available. 3.55 seems to be
available. The 3.73 or 4.1 would give you better performance off road
but your fuel economy would suffer on the road.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

On Sep 21, 10:47 am, Tracie <brain...@upstate.edu> wrote:
> 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.

If you want it too run like it does now the ideal gear ration would be
3.07*33/31 = 3.27 rounded up to what is available. 3.55 seems to be
available. The 3.73 or 4.1 would give you better performance off road
but your fuel economy would suffer on the road.

Re: RE-GEARING TO EITHER 3.73 OR 4.11 (repeat -- sorry)
 

nrs wrote:
> On Sep 21, 10:47 am, Tracie <brain...@upstate.edu> wrote:
>> 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.
>
> If you want it too run like it does now the ideal gear ration would be
> 3.07*33/31 = 3.27 rounded up to what is available. 3.55 seems to be
> available. The 3.73 or 4.1 would give you better performance off road
> but your fuel economy would suffer on the road.
>

Not necessarily. Her original tires were 225s I believe. If so her
original tires should be about 29", which would be close to the same
effective ratio as 3.55s with 33" tires. Going to 4.11s would result in
approximately 15% more RPM to attain the same speed. You have to
remember that going up in RPM doesn't cause a loss in fuel economy if
the gearing was too high to begin with. Since her highway RPM is below
the torque peak RPM of the engine, it is very possible she will see the
same, or even slightly improved economy. Besides, she is having to use
only 5th gear on the highway now, so obviously she needs more gear ratio.

Chris