rear diff fluid and g80
#11
Most synthetic gear lubes will not require additional additive. I know that the Amsoil Severe Gear has it in it and lube like Royal Purple are supposed to also. It will not hurt anything if you add it and you do not need it.
#13
Dont know about the truck, havent had to change it yet. But I do know that in my Chevelle (12 bolt posi) using synthetic AND the friction modifier did not work out well. Regular required one if not two to prevent clutch issues but using the additive and the synthetic just flat out made it too slippery.
Thread
Thread Starter
Forum
Replies
Last Post