Rebuilt Differential Help

[Just Fishing]

My vette with the oem limited slip needs the additive even though I use fluid that says it already contains it.

My S10 (ZR2) is probably closer to what the Tahoe's have.
I was always told that even though it's a G80, it's not a limited slip.
more of a locker that has clutches that just cushion it.

I had it lock on me one time doing a U turn in phoenix az, it was like 115 degrees outside.
it locked and I couldn't turn.
I went up onto the curb.

That was back when that s10 only had like 40k on it.

I was always told to never run the limited slip additive in the rear end of that S10, and to do my best to buy gear oil that doesn't specify it already has it.
I followed that and never had any issues.
When I gave the S10 away the rear g80 still worked, only thing done was to replace the bearings in it.
I didn't touch the internals of the G80.
just axle bearings, and new pinion bearings w/new seals.

When I gave it away I was at like 250-270k.
My nephew said it was amazing offroad, so I assume the G80 was still working for him.

 

[j91z28d1]

that's kinda been my experience. the fluid you can easily get all says limit slip additive, but it's not enough for a real one, but to much for these weird lockers.

so you gotta still add some, or try and find some without it. which I wasn't about to do. maybe straight non synthetic 80-90 if you could find it. but anything that said 75/90 has something about limited slip on the bottle.

which is why I give up, I'll just let gm do it and use what they call out. it's easier.

I do believe there's higher quality fluid than the oem stuff, like say an amsoil. but it's about having to guess if you got the right amount of friction modifiers for wear vs slip