The front won't work at all as it looks to be a high pinion. The rear will need a full set up/rebuild.
Re-gear question: 3.07 to ?
- Thread starter 1999tj
- Start date
The front won't work at all as it looks to be a high pinion. The rear will need a full set up/rebuild.
Cal
TJ Enthusiast
Hey man I know this is a really old thread but I just ran across it and I have Dana 30/35 with 3.07 gears and am thinking about changing to 4.10 (I may never run bigger than a 31” and definitely no larger than a 32” tire) and was wondering what you paid to have the regear done. TIA
Cal
TJ Enthusiast
Chris you are like the damn tree of life of the TJ Forums. Haha. Thanks a ton, man. I was thinking 2-2.5k so I’m happy to hear that lower “quote”.
Haha, no problem!
You'll have to call around a number of places, but there is even a shop here locally that does gears for $400 per axle (isn't that what you paid @psrivats?). That's very rare though. I've had two sets of gears done on both my TJs, and both times they charged me $600 per axle (not including parts). That seems to be a fair price. Anything less might be too good to be true (make sure to read reviews), and anything more expensive must be a very busy shop who can simply charge higher rates due to the demand.
Hi Jerry, Just learning more about re-gearing and wanted to better understand the calculations behind these. I recently upgraded to 37" (35.5" actual) on 2005 TJ with 6MT. Its certainly under-geared but fully "drivable". the intent is to use it on city roads only for short commute - no off-roading. (posted about it here)
There are lots of discussions with strong recommendations that even 4.56 is not enough for 35" tires and to go with to go 4.88 or even 5.13. In order to achieve the same "ground speed", upgrading 28" (stock factory size for 2005 TJ x) with 3.07 ratio to 35.5" would require gearing of 3.96 (226*3.07 / 175). This would give about 27% higher gearing ratio and seems accurate based on my speedometer off-set (actual speed is also about 27% higher than what speedometer shows).
So, unless my math is completely off, and since most recommend higher gearing (4.56 or 4.88 with 35") does that mean that the stock configuration is undergeared to start with? Thanks.
Which is why Gerry drives an automatic and why manufacturers have almost eliminated clutches. No one understands what overdrive is for so they let the computer do the shifting automatically. I tow a trailer in the mountains behind a TJR and down shift often but I still wish I had 3.73s instead of 4.10s. I do a lot of highway driving between jobs and 4.10s without a trailer are a bit too short at 70mph. Nothing wrong with dropping to 4th on a steep mountain grade.
Regear it to 3.07's so you can drop to second.
2005 TJ 2 door, 4.0L, just added a 4inch long arm lift kit. Moved from 15x9x31 tires/wheels to 15x12.5x33. Manual 6 speed tranny.
Tranny can no longer pull hills in 5th or 6th gear.
Differential is a 3:07 (current).
Tranny can no longer pull hills in 5th or 6th gear.
Differential is a 3:07 (current).
456 is a great ratio for 33’s with the 4.0 and 6-speed. I lived in Fredericksburg, TX (Hill Country) and never had trouble pulling hills with that ratio. I wasn’t hunting for gears either.
For a little more perspective, I’m currently running 456’s with 35’s and it’s not bad at all, but if I had a preference with 35’s I’d go with 488.
Last edited: