Great, thanks guys. Exactly the answers I was looking for. I had no idea about the D30a.
I think I need to use mine more. I'm definitely not knowledgable of how it works....but I believe no parts turn inside of the front diff unless I'm in 4hi or 4lo, correct? So most of it is up out of the oil for long periods of time if not used? Will they rust or is using it every couple months good enough to keep it protected with oil?
Does the transmission come with RTV from the factory, or with some kind of gasket?
Hey Tom, is 8 to 10 hours bad? I love blowing the day messing around with the Jeep.

But no I'm going to take advice and just fill it and drain it with my $10 mobil 1 75-90 a few times before my next scheduled change, then fill it up with the good stuff and call it clean.
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2005 KJ Renegade
Fabrications for sale:
Aluminum Roof Rack (See Page 9)Aluminum Gas Tank Skid --
Radiator Skid --
Front Strut ShimsComing Soon: Rear Bumpers with lots of options