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O
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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r
yes, I would put in the positraction additive to be safe,,rd
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Duncanville, TX - USA
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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/
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#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. 
Joel Adams
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O
I guess back to Manny, Moe, and Jack.
Thanks for th info. I didn't know if the extra additive was was too much.
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O
Oh, one other thing. Manny, Moe, and Jack= PEPBOYS
For the folks whom have never herd of'm
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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.
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B
I agree with Styer and make sure the additive says GM according to the local NAPA guy.Be the first to like this post
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O
Ok doky Tomar is the day. I gotta get the ol Blazer Inspected. Then I'll have time to. to do a seal replacement.
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M
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Send PMKingston, 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
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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.
MartinsVette 2008-02-20 19:27:14
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
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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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