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Chevy Positraction 1057721 #5445808 06/04/20 12:42 AM
Joined: Jun 2020
Posts: 1
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rorty Offline OP
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Joined: Jun 2020
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Are either or both of these following products equivalent to the above? : AC Delco Axle Lubricant SAE 80W-90 GL-5 10405-1 89021669 and GM Vehicle.Care Axle Lubricant SAE 80W-90 APL GL-5 89021669. If so, are these two products the same as one another? I own a 1987 Morgan Plus 8 with an unobtanium Salisbury LSD rear axle, so I cannot make a mistake in using a successor to 1057721. I want to use the correct product, one of these two or something else, with ACDelco Limited Slip Axle Lubricant Additive 10-4003 88900330. Any knowledgeable guidance would be appreciated!

Re: Chevy Positraction 1057721 [Re: rorty] #5445880 06/04/20 07:01 AM
Joined: Aug 2010
Posts: 2,325
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benjy Offline
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Joined: Aug 2010
Posts: 2,325
give redline a call, live tech + some of the best lubes at the higher price range.

Re: Chevy Positraction 1057721 [Re: rorty] #5445898 06/04/20 07:26 AM
Joined: Dec 2017
Posts: 6,707
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Snagglefoot Offline
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Joined: Dec 2017
Posts: 6,707
Also check with Yukon Gear

www.Yukongear.com

Last edited by Snagglefoot; 06/04/20 07:27 AM.

If you want the job done right......do it yourself.
Re: Chevy Positraction 1057721 [Re: rorty] #5445928 06/04/20 08:15 AM
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Snagglefoot Offline
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Here are some screen shots, firstly going back to what GM was using in 1987 in their diffs in trucks and two subsequent supersedes. Enjoy.

6274DBAC-1587-4658-A16F-3BD36E3B6CE1.png7B75B757-3697-41F1-8DEA-148752DCFA72.pngE262E503-6E23-43A3-AC7D-A4A9722FCBEF.pngBDAC8741-93B9-4B80-AAE4-922E43A1E773.png
Last edited by Snagglefoot; 06/04/20 08:33 AM.

If you want the job done right......do it yourself.
Re: Chevy Positraction 1057721 [Re: rorty] #5446120 06/04/20 01:19 PM
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Randy_R Offline
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GM has the additive. Ford has their’s and I’m sure Mopar has one too. Also, check with any parts store. All should work just fine. Be sure you get the right viscosity for your application and you probably want conventional as opposed to synthetic. Couple years ago I did my 67 Chevelle 12-bolt with Valvoline 80W-90 conventional with the GM additive. Prior to that I used Kendall LS lube no additive required. Recently I saw Castrol LS lube at O’Reilly’s. Brad PennGrade also makes GL-5 LS fluid. My 04 Silverado came with synthetic so I replaced it with Mobil 1 LS.


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