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Service bulletin 9774L80E03

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id52557
Published by NHTSA1997-08-14
Manufacturer's number9774L80E03
Manufacturer's date1997-06-01
NHTSA componentPOWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

UNDESIRED TRANSMISSION DOWNSHIFTING BETWEEN THIRD AND SECOND GEAR WHEN MANUALLY SHIFTED TO FIRST GEAR (D1) (NEW CALIBRATION). *TW

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Automatic transmission

Vehicles listed
CHEVROLET G SERIES1996
GMC G SERIES1996

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
0107300232001-10-24. Service bulletin. SOME OWNERS WITH VEHICLES BUILT BEFORE JANUARY 15,1999 MAY COMMENT ON A HARSH 1-2 UPSHIFT AND MAY ALSO HAVE A CHECK ENGINE LIGHT. *ET
0107300212001-06-26. Service bulletin. THIS TECHNICAL SERVICE BULLETIN STATES THAT TECHNICIANS MAY EXPERIENCE DIFFICULTY IN REMOVING THE CONNECTORS FROM THE PARK / NEUTRAL POSITION SWITCH, USUALLY WHEN TRYING TO REMOVE THE SWITCH DURING TRANSMISSION SERVICE. *TT
837110A2000-04-05. Service bulletin. PARK/NEUTRAL POSITION SWITCH CONNECTOR CANNOT BE REMOVED. YD
577126A1999-12-21. Service bulletin. TRANSMISSION FLUID LEAK FROM PUMP BODY (REPLACE BUSHING). *TW
667103A1999-12-20. Service bulletin. AUTOMATIC TRANSMISSION 1-2 AND/OR 2-3 UPSHIFT SLIP/FLARE, NO 3RD OR 4TH GEAR, DTC P1870, LAUNCH SHUDDER (REVISE VCM WIRING). *AK
7771531999-12-15. Service bulletin. CHUGGLE/SURGE ON TCC APPLY/NO DTC'S (REFLASH THE POWERTRAIN CONTROL MODULE). *TW
6771591997-08-21. Service bulletin. CLUNK NOISE ON ACCELERATION AFTER A CLOSED THROTTLE COAST DOWN (NEW TCC CALIBRATION). *AK
9774L60E08A1997-08-14. Service bulletin. AUTOMATIC TRANSMISSION 1-2 AND/OR 2-3 UPSHIFT SLIP/FLARE, NO 3RD OR 4TH GEAR, DTC P1870, LAUNCH SHUDDER (REVISE VCM WIRING). *TW
9674L60E04A1997-08-14. Service bulletin. TRANSMISSION FLUID LEAK FROM PUMP BODY (REPLACE BUSHING). *TW
577126B1997-07-17. Service bulletin. TRANSMISSION FLUID LEAK FROM PUMP BODY (REPLACE BUSHING). *TW