K 1500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Control Arm Bushing: All Technical Service Bulletins
Steering/Suspension - Front End Vibration
File In Section: 02 - Steering
Bulletin No.: 00-02-35-004
Date: June, 2000
TECHNICAL
Subject:
Steering or Front End Road Induced Vibration
(Install and Reinforce Revised Steering and Suspension Components)
Models:
1999-2000 Chevrolet and GMC C1500 Pickup Trucks (Silverado and Sierra)
Built Prior to the VINs
Important:
Canadian dealers require PRIOR District Service Manager approval to apply this bulletin.
Condition
Some customers may comment on a steering wheel or front end vibration.
Cause
Several components in the front end steering and suspension work in unison to isolate the driver from road irregularities and from road/tire induced
vibration. If any of these components are not working effectively, it will affect the other components of the suspension and steering system. Tire and road
vibrations may be transmitted to the passenger compartment and steering through the rack and pinion unit. Additionally, the mounting points of the
steering rack on the front frame crossmember may be amplifying any road vibrations.
Correction
In order to dampen unwanted vibration from the steering wheel, the following revisions must be preformed:
^
The tires must be in accordance with Corporate Bulletin Number 99-03-09-002 published August, 1999.
^
The steering rack must be replaced with a revised rack.
^
The left front steering rack mounting point must be reinforced.
^
The lower control arms must be replaced with units incorporating a revised bushing.
^
The power steering (PS) pump metering valve must be replaced with a revised fitting.
