Hey guys, this weekend I am changing my tcase and diff oil. Im a penzoil man myself, but what would be a good application for a rig with 135kmiles? Im going to buy it at pepboys most likely since you can buy it bigger than the 1 qt size. Note to self...wear the rattiest clothes i have. Any advantage with synthetic in the tcases and diffs. I use my 4x4 pretty often so heat is a factor especially the rear diff.

 

When I did my diffs and tcase I just went with good ole Mobil1 synthetic. You could go Amsoil though. How long has it been since you changed them?

 

I havnt done it since I owned the truck but th last owner said he did them a few months before I bought it. Im assuming 20-25k since he did it. I want to go ahead to do it to make sure I have a quality lube in there and now warren or some pos oil.

 

Use synthetic! Less wear, less heat, less resistance to moving (esp when freezing up north)