Well I was wondering what would be a good gear to run. I use my jeep mostly in the winter as dd and wheel it in the summer. I'm running 32" tires I would like to step up to a 35. Any input is appreciated!

 

yukon and superior make a great gear. stay away from genuine and motive. they are the number one gear we get into the shop with issues. 4.56 or 4.88. If you are running 35's I would be leaning toward 4.88

 

32 / 28.29 = 1.1311 X 3.55 = 4.01:1 gears

35 / 28.29 = 1.2372 X 3.55 = 4.39:1 gears

Those gear ratios with those diameter tires get you back to the factory equivalent mechanical leverage of stock 225/75/15 tires (28.29" diameter) and stock 3.55 gears. Going higher numerically gives more leverage (power) as going lower gives less.

 

This chart lets you look at the differences in ratios according tire diameter. Made it easier for me to understand.
http://www.4b.com/calc/geartable.htm

 

well my jeep is stock hight and i got 4.56 gears and s it amazing

 

Wait until you get your Jeep where yhou want it.(lift,tires). Then do your gears. If you want to run 35's , go with 4.56's. Nice set-up. X2 on the Yukon gears.

 

I've got 4.11s and have run 33's. It wasn't as sluggish as I expected, and is real peppy when I'm running the 31's. Most suggest 4.56 or 4.88's as already stated. It really boils down to what your gonan be doing with the truck.

If its just a DD like you said, you may wanna run the 4.56's as you'll get better gas mileage, not to mention in winter you shouldn't be trying to race anywhere.

 

Can I run 35s with 3.55 gears

 

Sure. Just don't expect to win any drag races.

 

or have decent mpg's. down shifts on hills

 

I agree with all these responses. My 90XJ has 4:11 w. 33's. My TJ has 4:88's w 37's and my 2000 XJ has 4:56 w. 35's...

Reason for my post is this. I caution against 4:88's in a dana 30. The pinion is so dinky that you'll bust rings. Trust me. I've popped like 5. And it SUX trying to get one home with 4 teeth missing off the ring. Can't even tow it...

 

i would say 4.56 but if youre def going to run 35's, id go with 4.88