rear gear lube

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Feb 21, 2005 | 06:00 PM

AlwaysWave

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Le Mans Master

Joined: Feb 1999

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From: Hoosier

Cruise-In III Veteran

rear gear lube

I'm almost done installing my new VBP fiberglass springs front and rear, so this might be a good time to change out the rear gear lube. I want to go synthetic, but I remember something about an additive for posi's that should go in. Is that right? Any recommendations?

Feb 22, 2005 | 08:55 AM

pws69

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Joined: Nov 2001

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From: Eastern US XX

Quote:

Originally Posted by AlwaysWave

Add 1 Bottle of GM Posi Additive and fill with your juice of choice (Mobil 1 Gear is a great choice!!).

Feb 22, 2005 | 09:09 AM

mandm1200

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From: New Cumberland PA

Some have said that certain lube(s) do not need the posi additive. I went with Mobil 1 and 2 bottles of GM Posi Additive. It's relatively easy to get and inexpensive to buy.

Feb 22, 2005 | 12:11 PM

mapman

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From: Wichita KS

Quote:

Originally Posted by mandm1200

Some have said that certain lube(s) do not need the posi additive. I went with Mobil 1 and 2 bottles of GM Posi Additive. It's relatively easy to get and inexpensive to buy.

GM has been recommending the Additive seems like forever. The GM part number and quantity needed is in your Owners Manual or the GM Shop Manual. I don't understand why some folks take a chance that their car doesn't need the additive. Just spend the few bucks and do it right.

Feb 22, 2005 | 12:42 PM

GTR1999

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Joined: Aug 1999

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From: Connecticut, USA

GM additive # 1052358 and their GEAR oil or any quality 90 wt gear oil. I don't use syn oil, per advice of Tom Watt or the US Gear Co technical engineer I once spoke with.
Gary