Hey ya'll, what type of oil are you using in you rear end and transfer case?

 

I use Royal Purple 75w/140 in the rear diff,Royal Purple already has the friction modifier in it,for limited slip,I haven't changed the fluid in the T-case yet but I think it a good synthetic ATF will do..

 

schaeffers 80-90 syn.

 

Same Royal purple 75-140 i put an extra tube of locker additive. it will hold about 3 Quarts and a tube of additive

 

Amsoil 75-140 for me.
The tag on the rear end calls for 75-140 synthetic fluid only.

 

Amsoil ATF in the transfer case. Amsoil 75w-140 syn GL-5 rated lube for the rear.

 

Mobil 1 75W-140 in the rear differential, no additive.

Valvoline Mercon/Dexron equivalent for the transfer case.

Pop

 

Mobil 1 here just did mine when I did my rear brakes.

 

Red Line Syn 75-140 & Mobil 1 syn ATF in the T Case.

 

rear diff-- Red Line Heavy Shockproof oil
Red Line Synthetic Oil - ShockProof® Gear Oils - Heavy ShockProof®

T/case -- Royal Purple Syncromax
Royal Purple Manual Transmission Fluid

Barney

 

Motorcraft left over from another project in the rear and Mobil 1 in the t-case.

 

Amsoil 75-140 Severe Gear and one bottle of the friction modifier from the dealership; also changed out to the 2008 diff cover for added cooling. While not a question from the OP, the fluid change actually made the semi-posi rear lock-up for a while like it should, but that only lasted 25K miles and it is now back to its full-open behavior, so it is looking like a Detroit locker is in the future if I do not want to get pulled out of deep snow again.

 

Mine is toast as well. I'm saving for a detroit Trutrack.