K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Output Shaft: All Technical Service Bulletins
Drivetrain - Transfer Case Output Shaft/Oil Pump
File In Section: 04 - Driveline Axle
Bulletin No.: 03-04-21-004
Date: May, 2003
INFORMATION
Subject:
Design Change of Rear Output Shaft and Oil Pump Replacement Parts
Models:
1999-2002 Chevrolet Silverado Pickup Models
1999-2002 GMC Sierra Pickup Models
All with Electronic Shift Two-Speed Transfer Case (RPO NP1) or
Manual Shift Two-Speed Transfer Case (RPO NP2)
EXCEPT Super Heavy Duty (SHD) with Allison(R) Automatic Transmission
(RPO M74) or ZF 6-Speed Manual Transmission (RPO ML6)
1.
During reconditioning of the transfer case, if the rear output shaft is faulty and requires replacement, the rear output shaft, old P/N 12473220, is
now being serviced with Rear Output Shaft Service Kit, P/N 88996610.
The service kit will include the following parts:
^
Rear Output Shaft - P/N 12384982
^
Oil Pump - P/N 12478084
^
Oil Pump Suction Pipe - P/N 12478087
^
Oil Pump Suction Pipe 0-ring - P/N 12478088
^
Oil Pump Screen - P/N 12478085
^
Connector Tube - P/N 12478086
^
Speed Reluctor Wheel - P/N 12478089
2.
Inspect the rear output shaft in order to verity if the shaft is the replacement design or the older design.
^
On the replacement rear output shaft (1), the spline area for the oil pump and the speed reluctor wheel is a larger diameter.
