jakedalton

I am in the middle of putting a 6.5" lift on my xj and I already have a set of 35" tires that i am going to run on it. What gears do i need for everything to run good and not kill my tranny? Also, when i put in the proper gears will my speedo be correct? Sorry for the noob questions but you have to learn sometime and why not ask the people who know. Thanks guys.

93XJLI

4.88s and youll need a new speedo gear, not sure which one though.

ktmracer419

4.88 minimum

will put your speedo closeish to stock, but you still may need a new speedo gear

jakedalton

anybody have any ideas which speedo gear and is there a link somewhere that tells the different gear ratios for different tire sizes?

93XJLI

http://www.go.jeep-xj.info/HowtoSpeedoGears.htm

COSXJFAN

With a D30 in the front, all you can do is go to 4.88s. That is the lowest gear that will fit in a D30, IIRC.

jakedalton

so when i do my gear change i need to change both the front and the back to 4.88 right?

lifted93xj

Yes or you will mess everything up

sk8ertht540s

im going to be running 35s and a 4.88 gear ratio! On the free way at 70mph i should be at 2300rpm!

TennesseeXJ

Im runnin my 35's on 4.10's right now and its a slug. It was perfect for my 33's but you need AT LEAST a 4.56 for 35" tires. I would just go ahead and throw in some 4.88's tho. You wont be sorry

ktmracer419

its always better to overgear a little than undergear a little

xj4fun

I agree learning is a great thing, and asking questions is wonderful way to learn. I also believe learning sometimes needs to be in steps like climbing a mountain.

I'm sure you know that is a lot of lift for 35's, which will create a high center of gravity.

How much experience do you have driving a rig with this much lift?

TennesseeXJ

x2 on this one. Im plannin on 5.13's when i get my D44 under there but im also going to 37's sometime in the future.

Also do you have a manual or auto transmission?

jakedalton

mines an auto

Natedg&2

4.56's will be as close to stock as possible with that tire size. If you are putting this size meats on though you will be off-roading it so i would say go lower like everyone else says and get the 4.88s.

You will have to get a new speedo gear though. You can find the right size by using the chart available in the link 93XJLI posted.