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Service bulletin 030730004B

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 id10004743
Published by NHTSA2004-01-05
Manufacturer's number030730004B
Manufacturer's date2005-09-01
Replaces030730004C
NHTSA componentPOWER TRAIN

NHTSA's summary

REVISION OF AISIN TRANSMISSION QUALITY CENTER (TQC) PROGRAM BEGINNING OCTOBER 1, 2003. *TT

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

Vehicles listed
CHEVROLET W-SERIES2003
CHEVROLET W35002004 to 2006
CHEVROLET W45002004 to 2006
CHEVROLET W55002004 to 2006
GMC W-SERIES2003
GMC W35002004 to 2006
GMC W45002004 to 2006
GMC W55002004 to 2006
ISUZU NPR2003
ISUZU NPR2005
ISUZU NPR2006
ISUZU NQR2003
ISUZU NQR2005 to 2006

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
SB-09-K-0012010-04-05. Service bulletin. ISUZU (CHEVROLET/GMC): THE TRANSMISSION SLIPS, WILL NOT SHIFT, OR MAY OVERHEAT. TECHNICIANS MAY FIND DTCS P0894 OR P0218 STORED EITHER CURRENT OR IN HISTORY. THESE CONDITIONS MAY BE CAUSED BY FRICTION MATERIAL DEBONDING FROM THE TORQUE CONVERTER CLUTCH. HARSH OR DELAYED SHIFTS, NO DRIVE, NO REVERSE, SLIPS AND THE SES/MIL MAY BE ILLUMINATED. *PE UPDATED 9/15/10. *PE
0507300302006-01-10. Service bulletin. USE OF SHRINK TUBING AROUND TRANSMISSION FLUID LEVEL INDICATOR (DIPSTICK) TUBE JOINT TO AVOID WATER INTRUSION. 2006 AND PRIOR CHEVROLET AND GMC MEDIUM DUTY TILT CAB MODELS AS WELL AS 2006 AND PRIOR ISUZU COMMERCIAL MODELS. *NM
055552005-09-15. Service bulletin. PROGRAM BULLETIN (CUSTOMER SATISFACTION PROGRAM)-AISIN ATF LEVEL GAUGE INCORRECT LENGTH. *SC
200507872005-09-15. Service bulletin. ADMINISTRATIVE MESSAGE-VEHICLES EQUIPPED WITH A 4HK1T DIESEL ENGINE AND AISIN AUTOMATIC TRANSMISSION HAVE AN AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL GAUGE WITH AN INCORRECT LENGTH. *SC
0407300082004-08-14. Service bulletin. AISIN AUTOMATIC TRANSMISSION FLUID SERVICE REMINDER. 2005 ISUZU NPR/NQR INCLUDED. *TT
0307300602004-03-04. Service bulletin. AUTOMATIC TRANSMISSION OIL COOLER FLUSHING ON CERTAIN MEDIUM DUTY TILT CAB MODELS AND COMMERCIAL MODELS INCLUDING MODEL YEAR 2004. *TT
0307300502004-01-05. Service bulletin. APPROVED AISIN AUTOMATIC TRANSMISSION ON-VEHICLE REPAIRS. 2004 MODELS INCLUDED. *TT
0307300352003-12-04. Service bulletin. REPLACEMENT OF OUTPUT FLANGE NUT WHEN SERVICING TRANSMISSION. ALSO INCLUDES 2004 MODELS. *TT
020730025B2003-10-01. Service bulletin. HARSH SHIFTING, DELAYED UPSHIFTS WITH POSSIBLE CHECK TRANS LAMP ILLUMINATED, POSSIBLE DIAGNOSTIC TROUBLE CODE (DTC) 21 SET. TO INCLUDE 2004 MODELS. *TT
0307300152003-08-29. Service bulletin. RELEASE OF NEW TOOLS FOR SERVICE: J 37228 - OIL PAN SEAL CUTTER, J 41736 - INSTALLER (REAR OUTPUT SHAFT SEAL) AND DT 46717 - REAR OUTPUT SHAFT SEAL REMOVER. *TT