I'm about ready to do a rear end and trans oil change so I've been reviewing a lot of the older threads regarding recommended oils for both. I've seen some conflicting information (I know, big surprise with so many people offering their opinions!). However, this is a pretty serious subject, as using the incorrect type could obviously damage the parts.
This thread pasted below mentions that some are using the same 75W90 gear oil in both the rear diff. AND the trans. How can that be good for the trans if GM recommends Dexron ATF (or alternately Tremec recommends Mobil 1 synthetic ATF)-- both of which MUST have much lower viscosity that 75W90 gear oil! What am I missing here?
https://www.camaro5.com/forums/showt...=519041&page=2