S10/T10 P/U 4WD L4-151 2.5L (1985)
Transmission Mount: All Technical Service Bulletins
Driveline - Noise or Vibration At 2,800 RPM
Number: 91-183-7B
Section: 7B
Date: February 1991
Corporate Bulletin No.: 067203
Subject:
DRIVELINE MOAN, DRONE, RESONANCE, VIBRATION AT 2800 RPM
Model and Year:
1984-86, 1989-91 S TRUCK WITH BORG-WARNER MANUAL TRANSMISSION AND 2.5L ENGINE
Some 1984-86 and 1989-91 S pickup trucks may experience a condition described as driveline moan, drone, resonance or vibration. This condition
usually occurs at approximately 2800 rpm when the cab and/or interior panels may buzz or vibrate.
Service damper kits are available for installation on these S pickup trucks. These dampers will significantly reduce vibrations in the 2800 rpm range.
Refer to the SERVICE PROCEDURE section for the specific action required for the model years listed.
VEHICLES INVOLVED
1984-1986 and 1989-1991 S pickup trucks (models S10603, S10653, S10803) equipped with 2.5L engine and Borg-Warner 4 or 5 speed manual
transmission.
SERVICE PROCEDURE:
1984 - 1986 S pickup trucks:
These vehicles can be repaired using the damper P/N 14073312 and method described in Dealer Service Bulletin 83-T-40. This bulletin calls for a
transmission mount change on some models. If the transmission mount features the dual captive stud mounting, the transmission mount does not require
replacement.
1989 - 1991 S pickup trucks:
Service damper kit P/N 15674891 containing a damper, new transmission extension housing with damper mounting bosses and fasteners should be
installed.
Figure 1 - Extension Housing Assembly
