So the GM additive I have 1052358, is it the same kind of additive as the upgrade from GL4 to GL5 is adding or is the additive upgrade from GL4 to GL5 only for higher pressure, not chatter?
If they are the same kind of additive, should I just buy GL4 & add GM additive as needed to stop the chatter? This way I know the clutches are grabbing the best they can wo/being annoying? or should I worry more about the gear stress(GL5), not the clutch slip at the track?
Lucas HD Plus, 80W90, Hypoid, GL5 has additive.
Valvoline HP 80W90, GL5 has additive.