I've been looking all over Google and searching throughout the forums, but I've only managed to get myself more and more confused.
I've got a 1997 Jeep Grand Cherokee Limited V8 5.2L with QuadraTrac. It's pretty much stock and isn't lifted at all, and I don't do any towing to speak of. The seal on the front differential is leaking, so I'm going to flush and fill the differential this weekend. Here are my questions...
First, and most important, which oil should I use? I don't have an owner's manual or service manual, and I've found several different answers online. It seems 75W140 is the most common, but a post in another thread mentioned that might be too heavy for northern climates. I live in southern Michigan, and it looks like it might be a nasty winter.
Second, should I use a traditional gasket, or PermaTex RTV silicone? The price difference is negligible, so is one better than the other? I noticed there are about nine million different varieties of RTV silicone, so which one is best for this application?
Third, if I'm removing the plate to replace the gasket, would it be worthwhile to perform any other maintenance on the differential? While I've got the plate off, is there anything else I should look for while I'm in there?
Fourth, friction modifier! The general consensus seems to be to throw in a bottle. Is there any reason why I shouldn't use friction modifier? Is it easiest to get it from a stealership? How much does a bottle of it cost?
Fifth, pumping apparatus! I can only get my car 16-18" off the ground, so I think a hand pump will make things a lot easier. Where can I get one of these? Would an auto parts store be likely to have something like this?
Thanks for helping a lowly newb!