Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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#391553 06/30/17 09:49 PM
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I remember back in the 70's there was an additive available for positraction rear axles. Is this still necessary, and if so, where can it be purchased?

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Willwood Engineering

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It still exists. Dealer, Amazon and many others sell it. Some synthetic gear oil contains it already (I think Royal Purple and Lucas?)

It's added to prevent chattering clutch plates in the posi unit when turning.


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Can be purchased from a GM dealer under part #88900330.


Gene Schneider
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Thank you gentlemen!

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I found that for some reason the only stuff that works is the GM additive, I don't know the exact reason as to why the other products do not work well. Every time I used them I had to remove the fluid and go back tot he GM additive, the clutches were locking up


John



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iagree
The GM brand is the only one that works.


Gene Schneider
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My experience is the same. 1971 K 10 with limited slip differential. Nothing worked except GM additive with GM lube.
I always heard it was whale oil. Can you comment, Gene?

Mike


ml.russell1936@gmail.com

Many miles of happy motoring
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The original additive was made from Sperm Wale Oil. At one point the Sperm Whale became off limits and a new formula was made. This was probably thirty or forty years ago.



Gene Schneider
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I've had success with the GM product as well.


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Grease Monkey
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Same experience dude!


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