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Post Info TOPIC: How much GM posi additive should I ADD?
jim larson


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How much GM posi additive should I ADD?
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Installed the rear cover today and added some gear lube and gm posi additive.  When searching the internet it seem most sites said 2 qts and one (1) 4 oz GM bottle of additive.  Then when doing a little research on rebuilding the carrier, a highly regarded corvette rebuilder that has been doing it for 47 years out in PA offer a full restro rebuild and it included 8 oz of the additive and 2 quarts of the fluid.  Makes one wonder.



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Jim L

Lake City
Bobs_Place


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As I recall start with 4oz, if the diff chatters or snaps on corners add 2oz more up to 8oz. The stuff is a friction modifier, so add only what's needed.

I would think to much additive would cause excessive clutch slippage.

I didn't use any additive, the diff would sometimes snap on starts during cornering but never any other time.



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Bob W.

Lino Lakes
jim larson


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Bobs_Place wrote:

As I recall start with 4oz, if the diff chatters or snaps on corners add 2oz more up to 8oz. The stuff is a friction modifier, so add only what's needed.

I would think to much additive would cause excessive clutch slippage.

I didn't use any additive, the diff would sometimes snap on starts during cornering but never any other time.

 Good to know.  When I got the red 66 SS it would do that snaping thing on corners.  It had a 2 series carrier with a spacer, I changed it to a 3 series and added  the additive, no   more sniping.



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Jim L

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