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REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
You are viewing this Usenet Newsgroup via Google groups. Sometimes they
can take days to update their Usenet feed. I am on a dedicated Usenet server that updates almost instantly. You get what you pay for.... I believe you will want at the 'highest', 4.11 gears. Others like even 'lower' gears like the 4.56 I think it is for 33's. The 3.73's are too high still and will make very little difference. Because you aren't going to Baha it off road or run bigger than 33's, the D35 rear will be fine. I doubt you will want a rear locker or even a limited slip due to your snow load. I am in Canada and have the same snow. A locker or limited slip is called a 'Low side finder' and does not track in a straight line well in snow, especially with a short wheelbase Jeep. Some can't even run the trails in the winter, because they have to crabwalk up an off camber trail and the trails are too narrow for this. When you see a pickup or something crabbing it's way up a snowy hill sideways, that is due to a locked rear end or too much gas on a limited slip, not fun. If I was going to run a limited or locker, I would want it in the front. It is a different story on dirt, where the limited slip or locker shines. With an open diff, one wheel acts like a rudder and you track straight. My $0.02, Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Tracie 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. > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
You are viewing this Usenet Newsgroup via Google groups. Sometimes they
can take days to update their Usenet feed. I am on a dedicated Usenet server that updates almost instantly. You get what you pay for.... I believe you will want at the 'highest', 4.11 gears. Others like even 'lower' gears like the 4.56 I think it is for 33's. The 3.73's are too high still and will make very little difference. Because you aren't going to Baha it off road or run bigger than 33's, the D35 rear will be fine. I doubt you will want a rear locker or even a limited slip due to your snow load. I am in Canada and have the same snow. A locker or limited slip is called a 'Low side finder' and does not track in a straight line well in snow, especially with a short wheelbase Jeep. Some can't even run the trails in the winter, because they have to crabwalk up an off camber trail and the trails are too narrow for this. When you see a pickup or something crabbing it's way up a snowy hill sideways, that is due to a locked rear end or too much gas on a limited slip, not fun. If I was going to run a limited or locker, I would want it in the front. It is a different story on dirt, where the limited slip or locker shines. With an open diff, one wheel acts like a rudder and you track straight. My $0.02, Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Tracie 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. > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
You are viewing this Usenet Newsgroup via Google groups. Sometimes they
can take days to update their Usenet feed. I am on a dedicated Usenet server that updates almost instantly. You get what you pay for.... I believe you will want at the 'highest', 4.11 gears. Others like even 'lower' gears like the 4.56 I think it is for 33's. The 3.73's are too high still and will make very little difference. Because you aren't going to Baha it off road or run bigger than 33's, the D35 rear will be fine. I doubt you will want a rear locker or even a limited slip due to your snow load. I am in Canada and have the same snow. A locker or limited slip is called a 'Low side finder' and does not track in a straight line well in snow, especially with a short wheelbase Jeep. Some can't even run the trails in the winter, because they have to crabwalk up an off camber trail and the trails are too narrow for this. When you see a pickup or something crabbing it's way up a snowy hill sideways, that is due to a locked rear end or too much gas on a limited slip, not fun. If I was going to run a limited or locker, I would want it in the front. It is a different story on dirt, where the limited slip or locker shines. With an open diff, one wheel acts like a rudder and you track straight. My $0.02, Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Tracie 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. > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
You are viewing this Usenet Newsgroup via Google groups. Sometimes they
can take days to update their Usenet feed. I am on a dedicated Usenet server that updates almost instantly. You get what you pay for.... I believe you will want at the 'highest', 4.11 gears. Others like even 'lower' gears like the 4.56 I think it is for 33's. The 3.73's are too high still and will make very little difference. Because you aren't going to Baha it off road or run bigger than 33's, the D35 rear will be fine. I doubt you will want a rear locker or even a limited slip due to your snow load. I am in Canada and have the same snow. A locker or limited slip is called a 'Low side finder' and does not track in a straight line well in snow, especially with a short wheelbase Jeep. Some can't even run the trails in the winter, because they have to crabwalk up an off camber trail and the trails are too narrow for this. When you see a pickup or something crabbing it's way up a snowy hill sideways, that is due to a locked rear end or too much gas on a limited slip, not fun. If I was going to run a limited or locker, I would want it in the front. It is a different story on dirt, where the limited slip or locker shines. With an open diff, one wheel acts like a rudder and you track straight. My $0.02, Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile... Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Tracie 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. > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
Tracie 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. > Your first post showed up here, but I will reply to this one. Sixth gear in your transmission has a .84 gear ratio, meaning that it will reduce your RPM by 16% when you use it. I'll assume your stock tires were 29". So with the 3.07 gears your RPM in 5th gear at 60MPH would have been approximately 1750 Assuming 60MPH at highway speed, your RPM will be as follows: 3.73 with 31" tires = 2040 RPM 3.73 with 33" tires = 1920 RPM 4.11 with 31" tires = 2250 RPM 4.11 with 33" tires = 2100 RPM These won't be exact because of the tires. They rarely measure the same as their advertised size. Anyway, if you're definitely going to 33" tires, I would personally just go with the 4.11s. Even with the 31" tires your highway RPM wont be excessive, and the driveability in 5th gear will be a little better than with the 3.73s and much better than with the 3.07s. There are a lot of articles out there about the D35 rear being too weak for off roading with big tires, but for your application you should be OK. The Dana 30 front is more than adequate. One note about changing gears. Make sure you find a reputable shop that knows how to do this. It is not difficult with the right tools, but it is definitely not for the average home mechanic. You may also want to look into a locker for the rear axle, which will give you more traction off road, but some of them can make driving in the snow a little tricky unless you have one of the switchable lockers. Regearing can get expensive when you start upgrading to Dana 44s, lockers, etc. so be prepared to spend some pretty serious cash. You may want to keep your eyes open for a used D44 with the gear ratio you decide to use. They are out there. Chris |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
Tracie 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. > Your first post showed up here, but I will reply to this one. Sixth gear in your transmission has a .84 gear ratio, meaning that it will reduce your RPM by 16% when you use it. I'll assume your stock tires were 29". So with the 3.07 gears your RPM in 5th gear at 60MPH would have been approximately 1750 Assuming 60MPH at highway speed, your RPM will be as follows: 3.73 with 31" tires = 2040 RPM 3.73 with 33" tires = 1920 RPM 4.11 with 31" tires = 2250 RPM 4.11 with 33" tires = 2100 RPM These won't be exact because of the tires. They rarely measure the same as their advertised size. Anyway, if you're definitely going to 33" tires, I would personally just go with the 4.11s. Even with the 31" tires your highway RPM wont be excessive, and the driveability in 5th gear will be a little better than with the 3.73s and much better than with the 3.07s. There are a lot of articles out there about the D35 rear being too weak for off roading with big tires, but for your application you should be OK. The Dana 30 front is more than adequate. One note about changing gears. Make sure you find a reputable shop that knows how to do this. It is not difficult with the right tools, but it is definitely not for the average home mechanic. You may also want to look into a locker for the rear axle, which will give you more traction off road, but some of them can make driving in the snow a little tricky unless you have one of the switchable lockers. Regearing can get expensive when you start upgrading to Dana 44s, lockers, etc. so be prepared to spend some pretty serious cash. You may want to keep your eyes open for a used D44 with the gear ratio you decide to use. They are out there. Chris |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
Tracie 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. > Your first post showed up here, but I will reply to this one. Sixth gear in your transmission has a .84 gear ratio, meaning that it will reduce your RPM by 16% when you use it. I'll assume your stock tires were 29". So with the 3.07 gears your RPM in 5th gear at 60MPH would have been approximately 1750 Assuming 60MPH at highway speed, your RPM will be as follows: 3.73 with 31" tires = 2040 RPM 3.73 with 33" tires = 1920 RPM 4.11 with 31" tires = 2250 RPM 4.11 with 33" tires = 2100 RPM These won't be exact because of the tires. They rarely measure the same as their advertised size. Anyway, if you're definitely going to 33" tires, I would personally just go with the 4.11s. Even with the 31" tires your highway RPM wont be excessive, and the driveability in 5th gear will be a little better than with the 3.73s and much better than with the 3.07s. There are a lot of articles out there about the D35 rear being too weak for off roading with big tires, but for your application you should be OK. The Dana 30 front is more than adequate. One note about changing gears. Make sure you find a reputable shop that knows how to do this. It is not difficult with the right tools, but it is definitely not for the average home mechanic. You may also want to look into a locker for the rear axle, which will give you more traction off road, but some of them can make driving in the snow a little tricky unless you have one of the switchable lockers. Regearing can get expensive when you start upgrading to Dana 44s, lockers, etc. so be prepared to spend some pretty serious cash. You may want to keep your eyes open for a used D44 with the gear ratio you decide to use. They are out there. Chris |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
Tracie 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. > Your first post showed up here, but I will reply to this one. Sixth gear in your transmission has a .84 gear ratio, meaning that it will reduce your RPM by 16% when you use it. I'll assume your stock tires were 29". So with the 3.07 gears your RPM in 5th gear at 60MPH would have been approximately 1750 Assuming 60MPH at highway speed, your RPM will be as follows: 3.73 with 31" tires = 2040 RPM 3.73 with 33" tires = 1920 RPM 4.11 with 31" tires = 2250 RPM 4.11 with 33" tires = 2100 RPM These won't be exact because of the tires. They rarely measure the same as their advertised size. Anyway, if you're definitely going to 33" tires, I would personally just go with the 4.11s. Even with the 31" tires your highway RPM wont be excessive, and the driveability in 5th gear will be a little better than with the 3.73s and much better than with the 3.07s. There are a lot of articles out there about the D35 rear being too weak for off roading with big tires, but for your application you should be OK. The Dana 30 front is more than adequate. One note about changing gears. Make sure you find a reputable shop that knows how to do this. It is not difficult with the right tools, but it is definitely not for the average home mechanic. You may also want to look into a locker for the rear axle, which will give you more traction off road, but some of them can make driving in the snow a little tricky unless you have one of the switchable lockers. Regearing can get expensive when you start upgrading to Dana 44s, lockers, etc. so be prepared to spend some pretty serious cash. You may want to keep your eyes open for a used D44 with the gear ratio you decide to use. They are out there. Chris |
Re: Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
On Fri, 21 Sep 2007 11:39:32 -0400, Mike Romain <romainm@sympatico.ca>
wrote: >I believe you will want at the 'highest', 4.11 gears. Others like even >'lower' gears like the 4.56 I think it is for 33's. The 3.73's are too >high still and will make very little difference. Given this vehicle has OD axle ratios are not as scarey. A 4.10 would be a big improvement and might be want you want based on your driving. A 4.56 would play better here if you live in a hilly area or at a higher elevation too. One more note, 3.73 with 33's is about the same in effective gear ratio as stock 225's and 3.07 gears which is no barn burner either. So you really do not want to go 3.73 route unless you plan to go to smaller tires than 33's. ----------------- TheSnoMan.com |
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