K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Automatic Transmission Dipstick - Dipstick Tube: All Technical Service Bulletins
A/T - MIL ON/DTC's Set/Delayed Engagement/Hesitation
Bulletin No.: 03-07-30-011E
Date: April 02, 2007
TECHNICAL
Subject:
Allison Transmission Delayed Engagement, Cold Hesitation, Malfunction Indicator Lamp (MIL) Illuminated, DTCs P0701, P1709, P1711, P1713,
P0841, P0843, P0847, P0870, P0872, or P0875 (Replace Torque Converter Relief Spring, Transmission Fluid Indicator and Lube Regulator Spring in
Front Support)
Models:
2001-2003 Chevrolet Silverado 2500/3500 Series
2001-2003 GMC Sierra 2500/3500 Series
with Allison(R) 1000 Series Automatic Transmission (RPO M74)
Built Prior to Indianapolis Plant Serial Number 6310234829, Baltimore Plant Serial Number 6320154492 and Remanufactured Transmission Serial
Number 9620011913
Supercede:
This bulletin is being revised to change the automatic transmission fluid to use from DEXRON(R)-III to DEXRON(R)-VI and change the Warranty
Labor Time information. Please discard Corporate Bulletin Number 03-07-30-011D (Section 07 - Transmission/Transaxle).
Condition
Some customers may comment that the transmission has a delayed engagement, cold hesitation or may illuminate the MIL on the first start-up after
sitting for a period of time.
Cause
Torque converter bleed down over an extended period of non-usage, usually over a week, may cause this condition.
Correction
Use the service procedure shown below to access and change the torque converter relief spring and lube regulator spring in the front support assembly.
Installation of these parts will not eliminate the torque converter bleed down or a potential delayed engagement. These parts will prevent transmission
DTCs and their resulting default actions associated with an extended period of non-usage.
A vented transmission fluid level indicator, P/N 15115171, should be installed after the transmission has been reinstalled. This vented indicator will help
to prevent fluid leaks out of the vent in cold weather operation. For additional information on this vented transmission fluid indicator, refer to Corporate
Bulletin Number 03-07-30-054.
After completing this modification, the transmission control module (TCM) shift adapts must be relearned for proper transmission operation. Follow the
procedure outlined in Corporate Bulletin Number 02-07-30-032A to quickly relearn the transmission shift adapts. Note that the fast learn procedure is
not available for 2001 model year vehicles.
The Allison(R) 1000 Series (M74) transmission has a dry weight of approximately 150 kg (330 lbs). The torque converter has a dry weight of
approximately 29 kg (63 lbs).
Use caution when removing, installing, servicing or moving the transmission in order to prevent personal injury.
Get assistance when lifting the transmission. A hoist is the preferred lifting device. Ensure that the lifting device is adequate to support the transmission.
Remove the transmission from the vehicle. After removal, return to this document for the transmission modification procedure.
Install the transmission holding fixture.
Remove the torque converter.
Remove the torque converter housing / pump assembly.
