Yea, another gearing question...

[flatpoint]

I have an 06 Rubi LJ, auto, 33/12.50 MT MTZs. Im either going to go with 4.56s or 4.88s. How I see it, the "56s" should put me back to stock gearing,(4.11s with 31" tires). Im thinking the "88s" would pull this overweight TJ a little better,(hard top, auto, winch soon). I think 200 RPM more at the same speed compared to stock would be a good thing. Is this the approx. diff. between the 4.56s and 4.88s? Thankyou.

[dadasjp]

I'm not sure if the 200 rpm is accurate, but it sounds about right, there are online calculators that can give you a number. I run 285/75/16 (33 x 11.5) mtr's on an '03 auto rubi with 4.88's and am very pleased with the gearing, not to mention I could jump to 35's and not have to touch the gears again. It did take a bit of getting used to the gear whine, but they mellowed after the break-in period. Make sure to follow the break-in instructions for your new gears. I ran mine on a few short non-highway break-in drives (10-15 mins) to get them to heat up a couple of times, then slowly moved up to highway speeds. After 500 miles I had the diffs drained, flushed and new fluid put in, haven't looked back since. Search the jeep forums and you'll find most folks do about the same to break-in new gears. Best of luck.

[DarkWolfTJ]

How are those 4.88's with 33" on the highway?

[cbrazor1]

im running 4.88s and 34s on the highway its great im runnin about 3000 rpms at 75 mph in 5th gear , runnin up the cajon pass no prob plenty of power, and on the trail in 4 lo much better

[miguelitojeep97]

right now I hate my 33s and 48s.......but just picked up my 35 inch MTRs so that should be a different story. Plus my front end vibrations are killing me!

but man I tell ya 48s and a 4:1. ssssaaawweeeeeeettt!