M/T - Shift Lever Vibration/Rattle In Third Gear
89Chevy16Number: 89-169-7B
Section: 7B
Date: May, 1989
Subject: THIRD GEAR SHIFT LEVER VIBRATION/RATTLE
Model and Year: 1986-89 S/T TRUCKS W/BORG WARNER FIVE SPEED MAN TRANSMISSION
Figure 1 - Identification Tag Explanation Chart:
TO: ALL CHEVROLET DEALERS
Some 1986-89 S/T Trucks may experience a shift lever vibration while the vehicle is in third gear. This condition may also be described as a rattle. The vibration may be most prominent on a coast down (deceleration) while in third gear.
Production Change
A new design shift lever was put Into production during the 1989 model year. Vehicles which have the new design lever can be identified by the serial number on the transmission identification tag. An example of the tag and its location on the transmission is shown in Figure 1. Vehicles with transmission serial numbers equal to or higher than those given below have the new design lever.
Vehicle Serial Number Breakpoint
T Series 21564
S Series with 2.5L Engine 72267
S Series with 2.8L Engine 23911
Service Action
For vehicles exhibiting third gear vibration that were built prior to the production incorporation of the new lever, the shift lever should be replaced with the new design lever. Reference Section 7B-3 of the Service Manual for replacement procedure.
The new design shift lever P/N is 15618925.
IMPORTANT: After shift lever replacement, assure that the boot assembly is positioned to ride as high as possible on the shift lever to reduce transmission noise into the cab.
For vehicles repaired under warranty, use the following Labor Operations and Times:
Labor Operation: K1060
Labor Time: .3 Hr