Use Mopar "Hypoid Gear Additive, Friction Modifier" - - part number 4318060 with regular lube.
One option for synthetic: "AMSOIL Severe Gear is compatible with most limited-slip differentials. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive."
http://www.amsoil.com/storefront/svo.aspx?=zo=1606470
Gary H.
> -------Original Message-------
> Since I have to put lube in my 4 speed and rear differential, I
> thought it might make the 4 speed tranny shift better. I can ask
> Brewers their opinion on what or if on the tranny lube, but who to ask
> on the shur-grip diff.?.......................MO
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