# Service bulletin 990421003C

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.

- Type: Service bulletin
- NHTSA id: 10004401
- Published by NHTSA: 2003\-12\-05
- Manufacturer's number: 990421003C
- Manufacturer's date: 2003\-08\-01
- Replaces: 990421003B
- NHTSA component: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

## NHTSA's summary

FRONT WHEELS SLIPPING WITH VEHICLE IN FOUR WHEEL DRIVE. \*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, Differential

## Vehicles listed

- 1999 to 2001 CHEVROLET BLAZER
- 1999 to 2001 CHEVROLET SILVERADO
- 1999 to 2001 GMC ENVOY
- 1999 to 2001 GMC JIMMY
- 1999 to 2001 GMC SIERRA

## Other bulletins for the same vehicles and component

- [PIP4054A](/bulletins/10024345.md), 2008-04-07, Service bulletin: SUSPENSION:REAR; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. EATON LOCKING DIFFERENTIAL CHATTER SHUDDER NOISE ON TURNS, EQUIPPED WITH A LOCKING REAR DIFFERENTIAL RPO G80. \*NJ UPDATED 7/17/2008. \*PE
- [010417001A](/bulletins/623047.md), 2001-10-25, Service bulletin: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. SOME CUSTOMERS MAY COMMENT ON A VIBRATION DURING ACCELERATION FROM 0 \- 40 KM/H \(0 \- 25 MPH\). \*TT
- [990421003B](/bulletins/619378.md), 2001-05-24, Service bulletin: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. SOME OWNERS MAY COMMENT ON A SLIPPING TYPE CONDITION AT THE FRONT WHEELS WHILE THE VEHICLE IS IN FOUR WHEEL DRIVE \(4WD\). \*TT

JSON: [/v1/bulletins/10004401](/v1/bulletins/10004401)

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