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differential lube change on '82 posi

Forum: C3 Engines, Driveline and Handling

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differential lube change on '82 posi

Posted: 8/28/08 6:27pmMessage 1 of 5
t
terntes
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Little Rock, AR - USA
Joined: 7/10/2007
Posts: 123
Vette(s): 1982 Collector Edition
I've heard some clicking noise lately as I drive very slowly, so I'm going to check for bad u-joints but, I'm not sure that's the culprit. I've heard the posi clutches make a noise also. So, I'm going to change that lube oil first, for sure, then check the u-joints. Trouble is I can't find the lube oil specs in any of my manuals, I guess I'm not digging deep enough. Can I get some help from my corvette friends, like how much gear oil and how much posi clutch oil, etc.?
Thanks in advance,
terntes
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differential lube change on '82 posi

Posted: 8/28/08 6:54pmMessage 2 of 5
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DaveM
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Flanders, NJ - USA
Joined: 1/27/2004
Posts: 2556
Vette(s): 1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.
Get GM posi fluid from your Chevy dealer. Suck out the old stuff, put the posi fluid in first, then the gear lube (90 weight I think) till it starts to run out of fill hole, put plug back in. Then go out and to some figure 8's to work in the posi fluid.

 

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Dave's '82

   

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differential lube change on '82 posi

Posted: 8/28/08 7:07pmMessage 3 of 5
K
KDADDY79
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
Hey terntes,
I changed mine back in May and had great results.

As I remember I pumped it out twice to clear out any debris.

As I remember, I did figure 8's too but was advised that some highway driving would have been better for it.

Take a look at "Differential Saved???" in C3 Driveline Components & good luck with it!

 



(link added)Adams' Apple2008-08-29 04:59:13
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differential lube change on '82 posi

Posted: 8/29/08 4:25amMessage 4 of 5
t
terntes
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Little Rock, AR - USA
Joined: 7/10/2007
Posts: 123
Vette(s): 1982 Collector Edition
Thanks, guys. I read the "diff....saved", I guess two bottles is the right amount. I have both Chilton and Haynes and neither manual mentions any posi clutch oil.
terntes
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differential lube change on '82 posi

Posted: 8/31/08 7:55pmMessage 5 of 5
K
KDADDY79
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
Hey terntes,
Check in the Mid America catalogue.
They list it as "GM Positraction Additive" at $9.99 per 4 Oz. Bottle.
 
I got mine at a local Corvettes only place and paid a bit more than that, but it was cash & carry.
 
I'd say to definitely use this additive! Don't leave it out.
 
Kevin
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in Forum: C3 Engines, Driveline and Handling


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