Regear from 3.07 to 4.10

Jamison C said:

You’ll notice a significant difference. 31s don’t have that much of a rolling radius so even in a hilly area, the 4.0 with 4.10 should have no issues pushing you along. You can take off in second gear a lot of the time, even in the 5-speed. My manual Rubi with 31s and 4.10s was great to drive and had no issues at high speeds or mountain grades.

I think with being a manual you would probably see a slight increase in mileage. You can control the shift points better for optimum throttle and power control. I knew the sweet spot for my manual jeeps and usually netted about 16mpg. With the auto I get about 13. YRMV.

Maybe $600-800 to do it yourself depending on what gear and bearing kits you buy. You’ll also need to change your carriers because the carrier break is 3.73. You might need to buy some specialty tools, but you might be able to rent them too. I plan to attempt my own regear this winter. Watch the BFH Garage “tutorial” on YouTube.

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Rickyd said:

Austin,I recommend finding some 3.73 or 4.10 factory axles. 6 cyl's had 3.73 stock and 4cyls had both 3.73,4.10 or 4.56 stock depending on the transmission.

If you take your time and find a good deal it will be way cheaper than regearing to a readily available stock ratio.you might even get some money back selling your 3.07 axles.

As for your questions-

5th gear will be much more usable and first will crawl a lot better.the jeep will be much peppier in general.3.07's are meant for 215/75-15 tires ONLY!

Your mileage should go up a bit if anything. Not down.you'll need less input from your right foot to move the jeep.

Regear prices aren't cheap. If you cruise some recent threads here and call shops for estimates you'll get a good idea. It is thousands.

Swooping on some stock axles can be 500$ if you look for jeep part out and axle posts.

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Mudflat said:

You’re going to love


You’re going to love 4.10 gears. Honestly, I will never understand why they ever put 3.07 gears in Jeeps. Your gas mileage will improve because you won’t have your foot in the gas all the time trying to maintain highway speeds. 4.10 gears would also be good if you ever went up to 33” tires.
While you’re in there changing gears I recommend installing some kind of lockers or limited slips & chromoly axle shafts because you’re already in there changing gears.
I know that our Jeeps are different because I have 33” tires & 4.56 gears, but here’s some “before & after” data concerning my gear change & getting rid of those awful 3.07 gears.
Good luck & please let us know how this works out for you.

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