Silverado 3500 4WD V8-8.1L VIN G (2006)
Clutch: All Technical Service Bulletins
A/T - Won't Shift Into Overdrive/DTC P0777 or P0735
TECHNICAL
Bulletin No.: 10-07-30-008B
Date: November 10, 2010
Subject: WOT 4-5 Shift Flare or Tie Up with DTC P0733, P0777, P0735 or P2723 Stored, Intermittent Slip in Reverse (Inspect Seals, Replace
Piston/Clutch Plates if Damaged)
Models:
2006-2011 Chevrolet Silverado
2006-2011 GMC Sierra
Equipped with Allison(R) 1000 Automatic Transmission (RPO MW7)
Supercede:
This bulletin is being revised to add the 2011 model year and additional conditions. Please discard Corporate Bulletin Number 10-07-30-008A (Section
07 - Transmission/Transaxle).
Condition
Some customers may comment that the transmission won't shift into overdrive, WOT 4-5 shift perceived as either tie-up or flare, intermittent slipping in
Reverse or shift inhibited when selecting Reverse. DTC P0777 Pressure Control Solenoid "B" Stuck On or P0735 Incorrect 5th Gear Ratio may be
stored. These conditions may not appear until after some mileage and operation, sometimes in the 32,000 to 64,000 km (20,000 to 40,000 mi) range.
Cause
This condition may be caused by a torn or cut 3rd, 5th and reverse clutch piston bonded seal.
Correction
Inspect the 3rd, 5th and Reverse clutch piston seals for tears or damage on the ID and OD lips and clutch plates for signs of excessive heat and slipping.
Replace the piston and clutch plates if damaged. Refer to 1-2-3-4 and 4-5-6 Clutch Assembly and 3-5 Reverse Clutch Assembly Installation in SI. Refer
to the GM Electronic Parts Catalog (EPC) for part numbers. Following the piston replacement, reset the transmission adaptive parameters and run "Fast
Learn."
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
