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Service bulletin 26TR01

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 id631897
Published by NHTSA2002-06-25
Manufacturer's number26TR01
Manufacturer's date2001-11-01
NHTSA componentPOWER TRAIN:MANUAL TRANSMISSION

NHTSA's summary

SUBJECT REGARDING 5/6000 SERIES SHIFT QUALITY IMPROVEMENT FOR THE FOLLOWING MODELS: 5963, 6063, M5600, M6600, M5610, AND M6610. *SLC

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, Manual transmission

Vehicles listed
GMC GM

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