what is the best fluid for the differential stock

[gnboostmex]

what is the best fluid for the differential stock

differential sounds like it would get stuck and positracction

any idea

 

[Roger]

I used Valvoline synthetic with a can of GM positrac additive.

 

[gnboostmex]

should be gear oil or any oil works

 

[83ttypecooled]

Hi,
Go for the gusto and use Royal Purple 80W 90, which has the additive already in it. Pricey,but a top notch synthetic that you won't have to worry about.

 

[gnboostmex]

and the sound it makes when turning the corner
as if the positraccion stay stuck ??????

 

[novaderrik]

should be gear oil or any oil works

80w-90 gear oil is recommended, but i used Amsoil 75w-90 in mine. i haven ever used any sort of posi additive, and i've never had any chatter. but you cna tell it has a nice tight posi when taking a turn on a street with a little sand on the road.

 

[gnboostmex]

maybe I do not understand the positraccion seems as stuck when turning
a sound similar to a welded diff

ok talvez no me doy a enteder mi diff suena como si se quedara atascado o puesto el posi en todo momento el sonido se nota cuando doy vuelta

 

[83ttypecooled]

Hi,
My tta was making all sorts of nasty noises on turns. I did the axle service with royal purple and NO additive,problem solved. You can use whatever fluid you like, but at $25 for two quarts and a gasket/silicone,It's good insurance. My rear end is now ready to put the power down.

 

[gnboostmex]

:biggrin:thanks for the help, it seems that this week will be of evenings too long, I have to put my GN to the point, f body radiator, b & m lock line, trans cooler, oil cooler from rx-7 2gen, trans temp gauge, tune up, Alky tuning, and I will be ready

 

[hensleyt]

dino

my Eaton book says mineral-based gear oil is required

 

[regal81455]

I was just going to say the pro's say NO!!! to synthetics when using a clutch type diff. Too slick and the clutch's start to slip.

 

[HyperV6]

Just buy original GM rear end oil and GM posi-additive. You can not go wrong. I think regular rear end oil is better than synthetics in this application. The carrier bearings take alot of load when brake torqueing.

Craig