WenmarOpen by Wenmar Pro

Service bulletin 990309002

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 id607591
Published by NHTSA1999-09-29
Manufacturer's number990309002
Manufacturer's date1999-08-01
NHTSA componentSUSPENSION

NHTSA's summary

EXPERIENCING A VIBRATION AND LATERAL SHAKE ON SMOOTH ROAD SURFACES. *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

Suspension

Vehicles listed
CHEVROLET SIERRA1999
CHEVROLET SILVERADO1999
CHEVROLET SILVERADO 15001999 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA1999
GMC SIERRA 15001999 (the catalog's model; the bulletin names a series or trim of it)
GMC SILVERADO1999

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
060309004N2019-11-25. Service bulletin. This technical bulletin provides a procedure to apply grease to the leaf springs to correct a condition of a squeak noise from the metals making contact.
060309004J2019-05-13. Service bulletin. This technical bulletin provides a procedure to apply grease to the leaf springs to correct a condition of a squeak noise from the metals making contact.
PIT3098G2019-04-08. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a lean to the left or right. Technician will need to measure fender wheel-opening heights, front and rear, to quantify vehicle lean. Fender wheel-opening heights are related to, but distinct from, trim height. The front wheel-opening height is known as P height, and the rear wheel-opening height is known as R height. Adjust and heights that are out of specification. After all adjustments are done, perform a front-end alignment and check headlight aim.
06-03-09-004F2018-12-10. Service bulletin. This technical bulletin provides a procedure to add a lubricant to the rear leaf springs to correct the customers concern of a squeaking noise from the rear suspension.
06-03-09-004F2018-06-25. Service bulletin. This technical bulletin provides a procedure to add a lubricant to the rear leaf springs to correct the customers concern of a squeaking noise from the rear suspension.
060309004K2018-06-04. Service bulletin. This technical bulletin provides a procedure to apply grease to the leaf springs to correct a condition of a squeak noise from the metals making contact.
06-03-09-004E2018-06-04. Service bulletin. This informational bulletin provides information for Squeak Noise from Rear of Vehicle Condition.
06-03-09-004F2018-05-21. Service bulletin. This technical bulletin provides a procedure to add a lubricant to the rear leaf springs to correct the customers concern of a squeaking noise from the rear suspension.
PI02003D2018-05-07. Service bulletin. This preliminary informational bulletin provides technicians a recommendation for when they are performing a front end alignment and find an alignment dowel pin missing .
PIT3098E2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a lean to the left or right. Technician will need to measure fender wheel-opening heights, front and rear, to quantify vehicle lean. Fender wheel-opening heights are related to, but distinct from, trim height. The front wheel-opening height is known as P height, and the rear wheel-opening height is known as R height. Adjust and heights that are out of specification. After all adjustments are done, perform a front-end alignment and check headlight aim.