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Old 02-07-2004, 06:58 PM
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which gear oil to use?

I bought a used 10-bolt Chevy 8.5 inch posi 3.73 rear-end. I will be installing it in my Camaro tomorrow and was wondering how much gear oil I need and what type. I have done some searching and ran across different opinions - some people mention 2 qts, some 5 qts.

Should I get 80w90 gear oil + GM posi additive (4oz or 7 oz bottle?)? Or 75W90? How should I add it - open the cover and pour all 2/5 qts in there? or fill all oil up through the filler valve?

Thanks in advance,
Denis
'67 Camaro RS

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Old 02-07-2004, 07:33 PM
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You fill the rear end through the filler hole until it flows back out the hole. No more. Should take less than 2 quarts.

Choice of oil is up to you.
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Old 02-07-2004, 08:44 PM
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Thanks for the reply, Poncho.

Is GM additive necessary?

On a label of the 80w90 gear oil can, there was a notice:
"slip diff. for top-off only". Does it mean I can't use it completely without a GM additive mix? I guess I don't completely understand the "top-off only" part.

Denis
'67 Camaro RS
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Old 02-08-2004, 04:15 AM
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Sorry, didn't see "posi" in 1st post.....you should use a posi track fluid. See your dealer, I'm not sure what it is called.
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Old 02-12-2004, 12:45 AM
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If you're doing a complete fill on a posi rear end, you must add the GM posi additive (friction modifier). For a top-off (adding just a little bit to bring it back to the top), you can use plain gear oil. If the rear end is still out & the cover's off, you can pour the specified amount of lube in before you put the cover on. Otherwise, use the fill hole like Poncho62 said. Put the additive in first so you don't run out of room.
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