Rear Gear Lube - Synthetic Or Conventional?

[Mike Pearson]

Originally Posted by 69camz28

I have a Strange S60 (Dana 60) in a 69 Camaro. I had it re-geared recently to a 4.30 gear and it has a Tru-Trac carrier. I was told that the gear company (Motive) recommends conventional gear oil - 75/140, and not to use synthetic gear oil. Thoughts on this?

Is the tru track a posi unit? if so use what Strange tells you to use. if it has a spool and is race only the synthetic works fine. I use it in my Dana race only with spool.