C4 General Discussion General C4 Corvette Discussion not covered in Tech

dif fluid

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Old

Jun 7, 2006 | 03:56 PM

#1

5pinball

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Burning Brakes

Joined: May 2006

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From: pa

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dif fluid

whats gm part # for r end fluid is it 89021669 api gl5 80 _90 had to go to dealer i cant stand but only game in area and i dont trust them tia

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Old

Jun 7, 2006 | 04:14 PM

#2

clf93lt1

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From: Richmond Va

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pn# 12345977 is what my 93 calls for, dont forget the limited slip additive.

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Old

Jun 8, 2006 | 02:56 AM

#3

skeet

Melting Slicks

Joined: Oct 2000

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From: prescott AZ

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Mobil 1 synthetic gear oil is a good upgrade from factory fill. I used it in all 3 of my C4's. Like any synthetic it will offer better protection than dino gear oil. Mobil says to use the GM posi additive which I did.

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Old

Jun 8, 2006 | 07:18 AM

#4

tomtom72

Melting Slicks

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From: Jacksonville, FL

St. Jude Donor '08 thru '26

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New to C4's, is there a p/n on the Mobil1 synthetic gear lube??

sorry for the elementary Q's!:o

Tom

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Old

Jun 8, 2006 | 04:45 PM

#5

5pinball

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Burning Brakes

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From: pa

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thanks for reply pt# i listed i listed is crrect new gm part3 I HAD valvoline 75-140 syn in 88 with90k and it wasnt happy its now working like it should maybe at 150k ill try heavier fluid again

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