9-7X L6-4.2L (2008)
Pressure Regulating Solenoid: Customer Interest
A/T - No Vehicle Movement in DRIVE or 3rd Gear
TECHNICAL
Bulletin No.: 08-07-30-027
Date: June 04, 2008
Subject:
No Movement When Transmission is Shifted to Drive or Third - Normal Operation When Shifted to Second, First or Reverse (Replace Forward Sprag
Assembly)
Models:
1982 - 2005 GM Passenger Cars and Light Duty Trucks
2006 - 2007 Buick Rainier
2006 Cadillac Escalade, Escalade ESV, Escalade EXT
2006 Chevrolet SSR
2006 - 2008 Chevrolet Avalanche, Colorado, Express, Silverado Classic, Silverado, Suburban, Tahoe, TrailBlazer
2006 GMC Yukon Denali, Yukon Denali XL
2006 - 2008 GMC Canyon, Envoy, Savana, Sierra Classic, Sierra, Yukon, Yukon XL
2006 Pontiac GTO
2006 - 2007 HUMMER H2
2006 - 2008 HUMMER H3
2006 - 2008 Saab 9-7X
with 4L60, 4L60E, 4L65E or 4L70E Automatic Transmission (RPOs MD8, M30, M32, M33 or M70)
Condition
Some customers may comment that the vehicle has no movement when the transmission is shifted to DRIVE or THIRD position, but there is normal
operation when it is shifted to SECOND, FIRST or REVERSE position.
Cause
This condition may be caused by a damaged forward sprag assembly (642).
Correction
When inspecting the sprag, it is important to test the sprag for proper operation by holding the outer race (644) with one hand while rotating the input
sun gear (640) with the other hand. The sun gear should rotate only in the counterclockwise direction with the input sun gear facing upward. If the sprag
rotates in both directions or will not rotate in either direction, the sprag elements should be inspected by removing one of the sprag assembly retaining
rings (643). Refer to SI Unit Repair section for forward clutch sprag disassembly procedures.
If the sprag is found to be damaged, make repairs to the transmission as necessary. A new forward roller clutch sprag assembly is now available from
GMSPO.