what weight gear oil 8.75?

[moparnut]

what weight gear oil do i put in my 8.75 suregrip? I want to use full syn. Does the GL-5 mean it already has the additive for posi's?

thanks

[moparnut]

bump

[Chryco Psycho]

80-90
the gl 4 is recommended for trannys , the gl5 is more slippery

[wagesofsin]

i just did mine , used the 80 - 90 gl-5 like cp said.

[moparnut]

thanks, how many quarts??

[wagesofsin]

4.4. pints is capacity.
buy 3 bottles, fill it till its just below the hole.
you'll have quite a bit left over.
 

[moparnut]

thanks

[ksierens]

I called the Ring and Pinion shop by me and they suggested no-synth 80-90w with the posi additive. I got my additive from GM for $12.

[moparnut]

why no syn? first i heard better isn't better

[ksierens]

Don't know, but since that is all they do for a living, I just decided to go with their recommendation.

[moparnut]

more than likely they recommend regular and not syn for the gear breakin period since they install new gears, just like an engine

[sadil340]

I've also found that synthetic leaks easier - probably because it's more "slippery"

[mopardave]

80-90 With the additive, 4318060AB still available and you at the dealer 7.67 for the little bottle.

[bb71challenger]

I dont think there is anything wrong with using full synthetic oil but get the additive anyway. I was under the impression that I did not need the additive when using full syn oil. Nothing wrong with what I had in there I just thought I would treat my 3.23 sure grip to a nice drink of "better" oil. 3 months or so later my sure grip pig was junk. Dyno with additive is what I will do from now on. Why spend the money on synthetic when you still have to get the additive anyway?

[moparnut]

well i already have the syn,
I believe you dont need additive unless you have a clutch type suregrip, mine are cone