Posi Lube and additive

[Jim Davies]

On Fri, 4 Jun 1999, Shannen Durphey wrote:

> Posi lube and additive are mentioned in an early 70's GM manual I
> have, as well as "special posi gear lube".  From my days in an axle
> and trans shop, I always run both for trouble free operation.  Part
> no. for the "special lube" is still good, but the bottle now reads
> "rear axle lubricant".
> 
> Despite some sales rep's claims, modern gear oil is not effective in
> reducing limited slip diff stick/slip in turns.
> 
As you add more posi additive, the co-eff of friction goes down. A
breakaway torque test would indicate a lower ft/lb reading. Therefor, a
minimal amount of additive is reccomended. In a lot of plate-type LSDs if
you add enough to eliminate clutch chatter on sharp, low speed turns you
have reduced the breakaway torque to nothing. This pacifies the old guys
who are noise sensitive...

> I have access to a case of DEXRON trans fluid, in metal cans.  Is
> there a shelf life for this?

Not as far as I know.