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Topic: rear gear oil

in Forum: C3 Driveline Components


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rear gear oil

Posted: 9/9/07 9:31am Message 1 of 10
OlrustysGhost
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Spotsylvania, VA - USA
Joined: 1/20/2007
Posts: 293
Vette(s): 1977 Silver Coupe
I stopped over at Manny, Moe, and Jack"s this morning and picked up some rear gear oil.
I'm getting ready to change the pinion shaft seal. The oil I picked up is :Castrol HYPOY C Gear Oil, Sae 80W-90.
One of the lines on the back say "Meets the service fill requirements of conventional and limited slip differentials". Do I still have to buy the additive ? I don't want to over do it.



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rear gear oil

Posted: 9/9/07 10:02am Message 2 of 10
rick d
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williamston, NC - USA
Joined: 1/19/2006
Posts: 353
Vette(s): 1969 coupe, 350, m22 trans, ac, black on black,
yes,  I would put in the  positraction additive to be safe,,rd


rear gear oil

Posted: 9/9/07 10:15am Message 3 of 10
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
I would add the posi additive too. Most of the gear lube these days have some kind of additive package that meets the requirement of late model stuff, but not necessarily for our classics. Better safe than sorry.


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rear gear oil

Posted: 9/9/07 10:37am Message 4 of 10
OlrustysGhost
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Spotsylvania, VA - USA
Joined: 1/20/2007
Posts: 293
Vette(s): 1977 Silver Coupe
I guess back to Manny, Moe, and Jack.
Thanks for th info. I didn't know if the extra additive was was too much.



rear gear oil

Posted: 9/9/07 10:39am Message 5 of 10
OlrustysGhost
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Spotsylvania, VA - USA
Joined: 1/20/2007
Posts: 293
Vette(s): 1977 Silver Coupe

Oh, one other thing. Manny, Moe, and Jack= PEPBOYS

For the folks whom have never herd of'm



rear gear oil

Posted: 9/9/07 7:18pm Message 6 of 10
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
BY ALL MEANS use the additive.  Suitable does not mean the additive is there.  Just means it can be used WHEN the additive is used.  AND when it is, it's usually not enough.


rear gear oil

Posted: 9/9/07 7:51pm Message 7 of 10
BKVETTE
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Calhoun City, MS - USA
Joined: 9/24/2005
Posts: 121
Vette(s): 1977 Black T-Top
Agree%20with%20Styer.%20And%20make%20sure%20additive%20says%20GM%20according%20to%20the%20guy%20at%20my%20local%20NAPAI agree with Styer and make sure the additive says GM according to the local NAPA guy.


rear gear oil

Posted: 9/10/07 4:00am Message 8 of 10
OlrustysGhost
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Spotsylvania, VA - USA
Joined: 1/20/2007
Posts: 293
Vette(s): 1977 Silver Coupe
Ok doky Tomar is the day. I gotta get the ol Blazer Inspected. Then I'll have time to. to do a seal replacement.


rear gear oil

Posted: 2/20/08 7:26pm Message 9 of 10
MartinsVette
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Canada
Joined: 10/17/2007
Posts: 39
Vette(s): 1980 Silver, L48 Totally re-built at 52,000 KM Now 355 CI Edelbrock Performer package Dual exhaust
I just did the 30,000 MI differential lube change and used the same Castrol HYPOY C Gear Oil, Sae 80W-90 and was told at the parts depot to put in the diff additive, so... that's what I did.
 
The hardest part was getting the old stuff out without driving the car to warm up the rear.  I used a little space heater and it worked fine.
 
M
MartinsVette2008-02-20 19:27:14


rear gear oil

Posted: 2/21/08 10:38am Message 10 of 10
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dwright
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Victor, NY - USA
Joined: 7/12/2004
Posts: 6842
Vette(s): 2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe
The posi additive is an extreme pressure lube.
It prevents the differential gears from scoring, so if you have Positraction, you need the additive.
It won't hurt anything if you don't have posi.



 
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in Forum: C3 Driveline Components


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