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#391553 - 07/01/17 01:49 AM Positraction additive
StoveboltSteve Offline

Backyard Mechanic

Registered: 09/01/11
Posts: 212
Loc: Coopersville mi
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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#391557 - 07/01/17 02:43 AM Re: Positraction additive [Re: StoveboltSteve]
canadiantim Offline

Backyard Mechanic

Registered: 06/26/07
Posts: 447
Loc: Alberta, Canada
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.
_________________________
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette

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#391558 - 07/01/17 02:43 AM Re: Positraction additive [Re: StoveboltSteve]
Chev Nut Offline




Registered: 01/08/02
Posts: 24245
Loc: West Allis,Wi.
Can be purchased from a GM dealer under part #88900330.
_________________________
Chevgene

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#391565 - 07/01/17 01:25 PM Re: Positraction additive [Re: Chev Nut]
StoveboltSteve Offline

Backyard Mechanic

Registered: 09/01/11
Posts: 212
Loc: Coopersville mi
Thank you gentlemen!

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#391633 - 07/03/17 05:29 AM Re: Positraction additive [Re: StoveboltSteve]
John 348/340HP Offline


1500

Registered: 12/16/01
Posts: 1971
Loc: Glen Cove, NY/ Ocala FL
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

if you never do nothing, you can never do nothing wrong! (think about it)

1950 2 door Styline Deluxe
1953 2 door 150 Sedan
1960 2 door Impala Hardtop 348/340HP 4spd
1962 2 door Impala Hardtop 409/409 4spd
1962 2 Door Biscayne Sedan 327/250 Auto
1975 Cosworth Vega #0718
1977 Monza Mirage 305 4 Speed
1985 Caprice Wagon w/Chevy V-8
1987 Celebrity Wagon
2005 GMC Safari
2013 GMC Sierra 2500 HD Diesel
2015 Cadillac CTS

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#391638 - 07/03/17 01:23 PM Re: Positraction additive [Re: John 348/340HP]
Chev Nut Offline




Registered: 01/08/02
Posts: 24245
Loc: West Allis,Wi.
iagree
The GM brand is the only one that works.
_________________________
Chevgene

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#391740 - 07/05/17 08:26 PM Re: Positraction additive [Re: John 348/340HP]
35Mike Offline

1500

Registered: 08/19/04
Posts: 1740
Loc: Columbia, MO
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.russell@mchsi.com

Many miles of happy motoring

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#391741 - 07/05/17 08:30 PM Re: Positraction additive [Re: 35Mike]
Chev Nut Offline




Registered: 01/08/02
Posts: 24245
Loc: West Allis,Wi.
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.
_________________________
Chevgene

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