Originally Posted By: Saturn_Fan
TC, while I have you here, I was wondering if you could help me out. I have that 95 Nissan pickup with a 5-speed and I want to change out the rear diff fluid and clutch fluid. I have no owner's manual with it. From what I have pieced together BOTH the clutch and the diff can use 75w-90. Does this sound right? I mean are there vehicles that use 75w-90 or 80w-90 or both clutch and diff? Just didn't sound right, but wanted to check with someone in the know like yourself.
75W90 synthetic should be fine for the rear differential. They may have recommended something different back in those days but with the quality of today's lubricant, I'd feel comfortable using any over-the-counter 75W90 synthetic in there.
As for the clutch, that takes brake fluid from what I can tell (according to the Amsoil app guide). From the limited automotive clutches that I've seen, all of them take brake fluid. I've never seen one that takes differential lube.