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Differential gear oil.

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Old Jul 29, 2004 | 01:34 PM
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Default Differential gear oil.

What kind does my 81 Vette take?
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Old Jul 29, 2004 | 01:57 PM
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Get 2 qts. of a name brand 75w-90 gear oil and a suction gun to take out the old oil. Then go to chevy for a bottle of posi lube additive ($8).
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Old Jul 29, 2004 | 02:24 PM
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Originally Posted by mvftw
Get 2 qts. of a name brand 75w-90 gear oil and a suction gun to take out the old oil. Then go to chevy for a bottle of posi lube additive ($8).

Ok thanks!

I just bought some 75w-90 for my truck, looks like I gotta go back to AutoZone for more

I love some Mobil 1 Syn
Does AutoZone not have posi lube? Because I got some from there for my F150....or does the GM version have better stuff in it?

Also is it pretty simple to change? I haven't looked under the car yet, so is the plug on towards the front or back?
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Old Jul 29, 2004 | 03:03 PM
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The Autozone here didn't carry any type of additives. The only place I could ever find it was the dealer... who charged a pretty penny for it... ($11)

You'll find the "drain" plug... and I use the term drain loosely.. on the back of the differential towards on the passenger side. I hesitate to call it a drain plug because it's high up on the housing... so as a result, you have to suction the old oil out somehow... unless you have the differential out of the car.

Best of luck.
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Old Jul 29, 2004 | 03:05 PM
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If I have much oil left..LOL

Is there a common leaking place on our corvette differentials?

Are differentials leaks hard/expensive to fix? I hope not
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Old Jul 29, 2004 | 03:07 PM
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GM or NAPA additive
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Old Jul 29, 2004 | 03:14 PM
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Originally Posted by Chumpzilla
You'll find the "drain" plug... and I use the term drain loosely.. on the back of the differential towards on the passenger side. I hesitate to call it a drain plug because it's high up on the housing... so as a result, you have to suction the old oil out somehow... unless you have the differential out of the car.

Best of luck.
It's more of a fill plug. Not a horrible job with a suction pump. I have a little pump for the drive unit on my boat. I use that.
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Old Jul 29, 2004 | 04:39 PM
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I've been thinking about switching to synthetic. Is the positraction additive still required with synthetic lube?
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Old Jul 29, 2004 | 04:41 PM
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Mobil 1, dude. That's all you need. Mobil says you don't need to add friction modifiers and I haven't in mine. It's been running fine for 40,000 miles and changing to it actually cured a clutch chatter problem I had before that.
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