Locking Differential - Revised Lubrication
File In Section: 4 - Drive AxleBulletin No.: 66-42-03A
Date: August, 1996
SERVICE MANUAL UPDATE
Subject:
Section 4B7 - Locking Differential, Revised Lubrication Information
Models:
1996 Chevrolet and GMC C/K Models
This bulletin is being revised to change the models applicable and to correct the lubrication Information. Please discard Corporate Bulletin Number 66-42-03 (Section 4 - Drive Axle).
The lubrication information on Page 4B7-11 in the 1996 C/K Service Manuals is correct.
^ Use SAE 80W-90 GL-4, GM P/N 1052271, oil when adding or replacing oil in the differentials supported in Section 4B7.
^ DO NOT use SAE 75 W-140 GL-5, GM P/N 12346140, in the differentials supported in Section 4B7.