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Old 08-29-2011, 11:09 am   #1
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Is GM P/N 88862624 still the latest part number for C5 GM differential fluid?


If I remember correctly it already contains the "modifier" and no additional additives are required.
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Old 08-30-2011, 05:12 am   #2
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Hi there,

Yes, you are correct.

Allthebest, c4c5
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Old 09-02-2011, 11:41 am   #3
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Quote:
Originally Posted by c4c5specialist View Post
Hi there,

Yes, you are correct.

Allthebest, c4c5
The service manual states the capacity of the differential is 1.69 quarts, but I can't seem to find the wrench size for the drain and fill plugs on the C5 rear end.
Last edited by Randyman; 09-02-2011 at 03:44 pm..
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Old 09-02-2011, 04:32 pm   #4
 
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Quote:
Originally Posted by Randyman View Post
The service manual states the capacity of the differential is 1.69 quarts, but I can't seem to find the wrench size for the drain and fill plugs on the C5 rear end.


The drain and fill plugs are 10mm hex.

The fill plug has a small, flat washer (on the differential side) that often falls off. Use caution when removing the drain plug so you don't let the washer fall into your drain tub.

Good luck.
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Old 09-02-2011, 07:44 pm   #5
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Remove filler plug first, just in case.

:)
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Old 09-06-2011, 09:32 am   #6
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I was just told my my local GM parts department part #88862624 was replaced by 89021677 ($38.99/bottle).

What the heck... Which is correct?
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Old 09-06-2011, 11:00 am   #7
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Quote:
Originally Posted by Randyman View Post
I was just told my my local GM parts department part #88862624 was replaced by 89021677 ($38.99/bottle).

What the heck... Which is correct?
I think the parts man is wrong. 89021677 is what is specified for HD pickups and maybe others with the G80 locking diff. It contains no modifier.

Mark
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