PatriotGT

Just got my 99 GC (4.0 auto / 242 t-case) and wanting to change
out fluids in axles and t-case. If I'm understanding the manual correctly,
I don't need the additives, but would like someone to confirm this, please.
Thanks, Larry

what oils do you use?

whowey

The only way you would need friction modifier is if you have a limited slip rear end. Otherwise, no need for additives.

PatriotGT

So, how can you tell? Just trying to confirm what "I" think I'm reading in the manual.
With mine being the select trac, no modifiers needed? Sorry, this 4WD stuff is new to
this old man.

whowey

Transfer case has nothing to do with that. A limited slip unit is in the rear differential.

A quick way to tell is to lift the rear tires in neutral and turn one... if the other turns the same way but slower you have a limited slip.. if it turns the opposite direction its an open carrier.

Or open the rear end up and look at the carrier....


Open carrier on the left.. Trac-Loc(Jeep branded limited slip) on the right