# Service bulletin 990421005

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: 10000081
- Published by NHTSA: 2003\-02\-12
- Manufacturer's number: 990421005
- Manufacturer's date: 2005\-12\-01
- Replaces: 990421005E
- NHTSA component: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)

## NHTSA's summary

TRANSFER CASE SHUDDER. \*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, Transfer case

## Vehicles listed

- 1999 to 2005 CHEVROLET ASTRO
- 1999 to 2005 GMC SAFARI
- 1999 to 2001 OLDSMOBILE BRAVADA

## Other bulletins for the same vehicles and component

- [3012B](/bulletins/10008806.md), 2004-08-23, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). THE NVG 136 ALL WHEEL DRIVE \(AWD\) TRANSFER CASE AND THE 236 AND 246 NVG SELECTABLE TRANSFER CASES OPERATING IN THE AUTO MODE MAY EXHIBIT A CONDITION OF A VIBRATION/SHUDDER DURING LOW SPEED TURNS SUCH AS A PARKING LOT MANEUVER, UP TO APPROXIMATELY 5 MPH. \*TT 3012A NOT YET RECEIVED. \*TT
- [01409](/bulletins/10004212.md), 2003-11-22, Service bulletin: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). THE NVG 136 ALL WHEEL DRIVE \(AWD\) TRANSFER CASE AND THE 236 AND 246 NVG SELECTABLE TRANSFER CASE SHUDDER ON TURNS. \*TT

JSON: [/v1/bulletins/10000081](/v1/bulletins/10000081)

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