I am planning on re gearing the XJ and was wandering what would be better for my set up.... 6 inch lift with 33's with the 4.0 HO engine.... 4:10s or 4:56s? possibly 4:88s??? im in stop and go traffic alot.... its my daily driver as well....

 

plannin on gettin bigger tires? if not probly the 4:56's

 

if you go with the 4.88s youll pick up some low end torque. plus you could go with bigger tires.

 

bigger tires are NOT in the near future.... but possibbly in the farther off future.... 4:56s it is

 

id go 4.88...it isnt gonna cost you much more...more low end!

 

oh.... well then

I didnt know how much more it would be....

thanks much

 

Will the 4.88's fit in the stock carrier w/o modifications or do you have to replace it for one with a lower factory gear? Im planning on 4.56 or 4.88 myself.

 

Depends on your axle. I plan on going with 4:56s for 33's because the Dana 30 can have alot of strength issues with 4.88s.

You greatly increase the chance of grenading the diff if your running 4.88's on a dana 30 with 33s and up.

 

wouldn't 4.88's be overkill if its a daily driver? I was thinking of doing 4.56's but now I'm not so sure

 

go with 4.56's.

 

aint no kill like overkill

i run 5.38's with 35's and it is sexy

 

im thinkin 4:56s..... yea thats what i'll do.... I dont have the funds to do anymore mods if I put the 4:88s on..... thanks for the info everyone

 

Your transmission is an AX15. That trans is geared lower, that's why the manuals came with 3.07 gears, and the automatics came with 3.55 gears. so anywhere you would use a 4.56 on an automatic, you would use a 4.10 on a manual. get what I'm saying? so 4.56 on a manual will be like 4.88 on an automatic.

 

I kind of agree. I have an AX-15 with 33s and 4.56s and wish I had a little less gear on the highway. I actually think something like a 4.30 would be perfect for me. When I had 31s I had 3.73s and thought something a little deeper would have been perfect, like a 3.91. Back in my old Mopar muscle days 3.91s and 4.30s were common. It seems like the axles in Jeeps tend to skip those "in between" gears. I don't know if maybe they are available but just not common.

In short, if I had it to do again I would have tried to find 4.30s, or failing that probably gone 4.10s instead of the 4.56s I have. I tend to like to go faster than I should on the highway so that's probably a big influence. I go noticably slower in my XJ on the highway that my other vehicles because I don't like the RPMs. Although it is nice to never have to downshift on the highway, even on some pretty big hills.