Savana 3500 V8-6.6L DSL Turbo VIN 6 (2007)
Fluid Line/Hose: Technical Service Bulletins
A/T - Revised Converter Check Valve/Cooler Line Fitting
INFORMATION
Bulletin No.: 04-07-30-017B
Date: November 25, 2008
Subject:
Information on 4T65-E MN7, M15, M76, MN3 Automatic Transmission Case, Cooler Fitting and Torque Converter Drain Back Check Ball Change
Models:
2008 and Prior GM Passenger Cars and Light Duty Trucks
with one of the HYDRA-MATIC(R) Automatic Transmissions shown above.
Supercede:
This bulletin is being revised to update the Parts Information. Please discard Corporate Bulletin Number 04-07-30-017A (Section 07 -
Transmission/Transaxle).
Effective with Julian date 4019 (January 19, 2004), the 4T65E transaxle cases and cooler fittings have changed and are not interchangeable with past
models. The technician may find that when replacing the inlet or outlet transmission cooler lines, the new lines cannot be connected to the transmission.
A change to the transmission cooler line fittings was implemented in production on February 1, 2004. The cooler line fittings were changed to a design
with a longer lead in pilot (1). The cooler line fittings with the longer lead in pilot will not fit on models built before February 1, 2004.
The longer lead in pilot fittings (1) (9/16-18 UNF) have replaced the shorter lead in pilot fittings (2) (3/8-18 NPSF w/check ball & 1/4-18 NPSF).
If the transmission cooler lines will not connect, then replace them with the following cooler line fittings as appropriate with the older, shorter lead in
pilot design:
^
For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Inlet Hose, P/N 20793004.
^
For vehicles built after February 1, 2004, use Transmission Fluid Cooler Inlet Hose, second design P/N 15264588.
^
For vehicles built prior to February 1, 2004, use Transmission Fluid Cooler Outlet Hose, P/N 20793005.
^
For vehicles built after February 1, 2004, use Transmission Fluid Cooler Outlet Hose, second design P/N 15264589.
