Sorry to beat a dead horse, I am not trying to keep this going but here is what it says on the label: Valvoline High Performance Gear oil 80W-90. Recommended for Hypoid differentials (conventional and Limited slip) where API GL-4 or GL5 is specified and non synchronized manual transmissions where GL-5 is specified.
Sounds like this is not recommended for Transmissions that have Syncros but the Chilton book says 80W-90, gl-4, gl-5, 75w90 is okay. I purchased that because it looked like it covered everything.
What do you guys recommend?
