Astro Van M V6-262 4.3L VIN W CPI (1992)
Axle Shaft: All Technical Service Bulletins
Drivetrain - Front Axle R&R Precaution/Vibration
Number: 92-23-4C
Section: 4C
Date: OCT. 1991
Corporate Bulletin No.: 164303R
ASE No.: A3
Subject:
REPLACING FRONT AXLE PARTS MAY RESULT IN VIBRATION
Model and Year:
1990-92 L VAN
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN N0. 91-393-4C, DATED AUGUST 1991. THE 1992 MODEL
YEAR HAS BEEN ADDED AND THE WORDS "PINION OIL SEAL" DELETED FROM THE SECOND PARAGRAPH. ALL COPIES OF
91-393-4C SHOULD BE DISCARDED.
Each front axle for 1990-1991 L Vans is balanced with the pinion flange assembly modified to act as a harmonic member which reduces audible
driveline disturbance.
Replacing the ring and pinion gear set, pinion flange assembly, or the pinion bearings may disturb the balance integrity of the axle and result in vibration.
Do not replace either the ring and pinion gear set, pinion flange assembly, or the pinion bearings in a 1990-1991 L Van front axle. If replacement of one
of these parts is necessary, replace the axle assembly using the system balanced service axle assemblies listed below.
Prior to replacement of axle assembly, it is essential that the position of the propeller shaft relative to all of the driveline components be observed and
reference marked. When replacing pinion seal, pinion yoke must be referenced to pinion, to assure re-assembly in original position. All components must
be reassembled in the same relationship to each other. Attach propeller shaft to replacement axle first, then to the transfer case, and road test. If vibration
is noted, then reindex propeller shaft to transfer case and test drive again.
SERVICE PARTS INFORMATION:
Vehicle
Axle Ratio
Part Number
Description
L Van
3.42
26022779
Service Axle Assembly
L Van
3.73
26022781
Service Axle Assembly
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
Labor Operation:
F2142
Use applicable labor time guide for labor hours.
