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Old 08-08-2019, 06:22 PM   #15
SCZ
 
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the track prep guide suggests 75W-90 LimitedSlip: GM Part No. 88900401. It doesn't mention the additive. Is the additive necessary?
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Old 08-08-2019, 06:40 PM   #16
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No additive necessary.


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Originally Posted by SCZ View Post
the track prep guide suggests 75W-90 LimitedSlip: GM Part No. 88900401. It doesn't mention the additive. Is the additive necessary?
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Old 08-08-2019, 06:58 PM   #17
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Quote:
Originally Posted by SCZ View Post
the track prep guide suggests 75W-90 LimitedSlip: GM Part No. 88900401. It doesn't mention the additive. Is the additive necessary?
The additive is in the GM diff fluid.

Here is the part#: GM 88862624 w/limited slip friction modifier.

Like $22-24 bucks on Amazon.


EDIT: Sorry... 88862624 is what we used in the Corvettes.
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Old 08-08-2019, 08:17 PM   #18
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Quote:
Originally Posted by Biergut View Post
The additive is in the GM diff fluid.

Here is the part#: GM 88862624 w/limited slip friction modifier.

Like $22-24 bucks on Amazon.


EDIT: Sorry... 88862624 is what we used in the Corvettes.
$15
88900401
https://www.summitracing.com/parts/ado-10-4016
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Old 08-08-2019, 08:50 PM   #19
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No additive. It will decrease performance of the unit, though will quiet it down. Use the 401 fluid, non-additive.
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Old 08-09-2019, 11:34 AM   #20
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thanks so much.
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