what brand gear oil to use on new rear

[MaxPlusTen]

Hey guys, i picked up a 3.42 rear end out of an 00 SS last week to tide me over till summer gets here and i can get a 12 bolt in it.... just wondering what gear lube oil you guys recomend. I was thinking royal purple... but i want to get the best bang for the buck.

[Siciliano15]

Hey guys, i picked up a 3.42 rear end out of an 00 SS last week to tide me over till summer gets here and i can get a 12 bolt in it.... just wondering what gear lube oil you guys recomend. I was thinking royal purple... but i want to get the best bang for the buck.

i use royal purple in both my trans am and dakota r/t. They both have auburn differentials (T/A stock and R/T i put in) and the royal purple cuts down on noise and makes the differential perform noticeably better than regular dino oil or amsoil synthetic which i also tried. if u have the newer style zexel torsen differential, it might work better with something else but just figured id share my experience.

[Mr. Luos]

I use good old Valvoline 80w-90 in mine.

[INMY01TA]

Any dino 80/90.

[chaosinfinite]

I use good old Valvoline 80w-90 in mine.

What about 75w-90? Do you have to get the Limited slip additive seperately from somewhere?

[INMY01TA]

What about 75w-90? Do you have to get the Limited slip additive seperately from somewhere?

75-90/80-90 close enough. Ls additive can be bought at the dealership. I usually throw one bottle in.

[666ws6]

You can find the limited slip additive at AutoZone too. I just ordered some qts of royal purple gear oil, which doesn't require any additional additive. I had always used basic oil, but now that I have new gears, I want something with a touch more prevention.

[Wesman]

I run Mobil 1 Synthetic 75W-90. Its got a wider viscosity range than conventional 80W-90, so it is better for colder weather. It also offers better wear protection and longer change intervals since its full synthetic.

You can get it at most auto parts stores, about $8 a quart.