rharville

So I plan to upgrade the gears in my diff's from the stock 3.55 to 4.10's. What do I need besides the ring&pinon sets, seal, bearings, etc.? Do I have to replace the diff case and gear sets?

Atmos

2 ring and pinions
2 complete installation kits
1 new 3.73 and up carrier for the front D30 axle

xjmarc

The small gain you'll get with 4.10s vs 3.55s isn't worth the cost of the gears and install. You're looking at close to a grand and you won't really notice much if any of a difference.

Atmos

yep. 4.88's or nothing. if I had the choice when I did mine it I would have regeared as deep as possible

rharville

I will feel the difference. I feel the difference with the 3.55's with my lift kit. I also tow a 4000 pound camper...it's to help my transmission. What about the gear sets, they seem very specific to sizes. Do I need to replace the stock gear set or not?

Atmos

do you need to replace the stock gear set.. when regearing? yes. for towing with an automatic, a nice transmission cooler will also work wonders

fathan16

just find some axles from a 4 cylinder and swap the whole things... also what the heck are you doing towing a 4000 pound camper in an xj anyway???

my jeep has 4.88's on 31's right now with a spartan... it does donuts like no other

Xjtim

Jesus...lol, you should run the 1/4 mile and see what your time is!

fathan16

probably about a minute

mr white

Axles from a 4 banger is the best idea yet assuming he can find a rear that's not a d35.