ChilliXJ

My XJ is 1999 4.0 and Im changing my tires to 31x10.5.15.
First question, am I 3.55 axle gearing or 3.73?
Axles are stock with LSD in the rear.
I do have a tow hitch but looks aftermarket fitment.

Speedometer gears I believe I need is 32? They seem to come in short shaft or long, how do I know which one I need?

SeriousOffroad

SteveMongr

Look for a metal tag on differential bolts. The tag states the gear ratio.
You can also get a 'build sheet' from Jeep for free.

Older jeeps (1991?) with a cable driven speedometer use the long shaft speedometer. Electronic speedometer uses short shaft.

salad

4.0L automatic only shipped with 3.55:1 in 1999.

If your tag is intact that'd be a bonus to verify. Otherwise the only way to know if it was ****ed with is to check: put it in Neutral, jack up the end, turn the drive shaft by hand. 3.5ish revolutions of the shaft to 1 turn of the tires and you have an answer!

cruiser54

Geez Frank. Way to beat around the bush. LOL.

Sideways99

thanks for saving me from having to search

cruiser54

Got one for the earlier models?

ChilliXJ

Thanks guys Ill look at my TC and go from there

SeriousOffroad

Does the Pope wear a funny hat when he craps in woods?

SeriousOffroad

And take a S.W.A.G. at where you can get 'em for a great price.

cruiser54

I give up. Where?