Barto,

I ended up going with mobil 1 75w140 front and rear. You do not need to use friction modifier with the mobil 1 lube. If you want to save a few bucks and you aren't towing you can use mobil 1 75w90 in the rear.

Yeah I tow a few times a year, got the trailer brake controller installed so I will go with the 75w140. Thanks for the quick response, much apreciated.

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02 KJ Sport w/ tow group, offroad package.

Changed it out today. Everything went smooth and no leaks (yet). Front diff was way easy even with taking off the skid. The back kinda sucked since I didn't have much room, but nonetheless its back together.

One thing I noticed is that the Engine skid is a bit damp with oil. I just got it changed at a quick lube and I am hoping they were just sloppy. It is all wet and the axle that goes to the transfercase seems wet as well. Any body see this before.

-BTW: I live in Fowlerville, MI. Thought I would let you know Detroit_Doc.

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02 KJ Sport w/ tow group, offroad package.

my manual doesn't say to use 140 in the front, it just says Mopar gear oil and it mentioned to use 140 in the rear for towing. Where is everybody coming up with the fact the front needs 140?

My service manual sez so. You can use 75W-140 syn. in both.

it says so for an 02?

Mine's an '03, but I would bet there's no difference.
JP

I used the 75-140 Mobil1 (in both) and it seems great. I had clutch chatter in my lsd rear end before the fluid change and it is completely gone now.

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02 KJ Sport w/ tow group, offroad package.

Mobil 1 75w140 without friction modifier worked great for me too. I never had clutch chatter before. I still have no clutch chatter but it seems like my LSD locks up harder (more torque transfer to the tire with traction) than it used to.