mushroom281

iTrader: (40)

I bought 2 bottles of the GM additive but the auburn cam with a bottle also which did you guys use and what diff fluid?

thanks

ULTIMATEORANGESS

iTrader: (4)

i used GM additive and lucas gear oil.

Gonzo1

What weight of lucas gear oil did you use and is this synthetic or non synthetic? And is this ok for the factory installed auburn diff?

TheBlurLS1

iTrader: (8)

non-synthetic for factory auburn.

i used 84w-140 non synthetic in my 10 bolt before it blew. i bought 2 bottles of it and emptied a bottle of gm friction modifier into each bottle of gear lube before i put the lube in. i used such thick stuff to try and quiet it down some, wont hurt anything.

ULTIMATEORANGESS

iTrader: (4)

i bought my unit from a guy who builds rears.he recommended using it.it was syn.i dont remember the weight but the guy builds rears for alot of fast cars and is well respected so i took his advice.