Drivetrain - Slight Torque Steer During Acceleration
91buick09
Bulletin: 92-3-4
Date: Nov. '91
Ref. No.: 92-44-3
Corp. Ref. No.: 106001
SUBJECT: SLIGHT TORQUE STEER ON ACCELERATION
MODELS AFFECTED: 1991-92 PARK AVENUE/ULTRA 1992 LESABRE
CONDITION:
A condition of slight torque steer to either the right or left, during acceleration, may be experienced on the above vehicles. This condition may be caused by the engine/transaxle assembly being misaligned in the frame, resulting in improper drive axle operating angles.
Torque steer should not be confused with radial tire lead or pull. Review the front wheel drive radial tire lead/pull chart in Section 3 of the Chassis Service Manual for more information.
DEFINITIONS:
Lead or Pull: Vehicle movement to the left or right, with the transmission in neutral, from a straight path on a level road with no input to the steering wheel (hands off).
Torque Steer: Vehicle and steering wheel movement to the left or right on acceleration.
CORRECTION:
Follow the tree chart. Vehicles requiring additional shims under the Torque Axis Mount must install longer bolts, Part No. 11509591 to assure proper retention of the mount. Parts are currently available from GMSPO.
A new angled rear torque strut has been released for service. Vehicles that may require the new rear torque strut are listed below by series. Vehicles built after the breakpoints were produced with the new strut.
Park Avenue/Ultra 1991-92 Start of Production thru N1617533
LeSabre 1992 Start of Production thru NH434798
Order Part No. 22112202 torque strut and 22112068 bracket for vehicles requiring the strut. Vehicles equipped with an oil filter drip pan also requires one 1623567 stud. L67 supercharged vehicles were produced with the new designed torque strut. Do not replace torque struts on these vehicles. Parts are currently available from GMSPO.
TORQUE STRUT REMOVAL
Refer to Section 6 of the Service Manual for additional information.
1. Remove the torque strut from the frame bracket.
2. Remove the rose bud fastener that holds the oil filter drip shield from the transmission bracket, if so equipped. Unscrew the rosebud to prevent damage to the fastener.
3. Remove the transmission bracket.
4. Remove the frame bracket.
TORQUE STRUT INSTALLATION
FIG. 1:
1. Install the frame bracket and secure it to the frame using the outer bolt holes (closest to the passenger side). Be sure that the bracket is installed with the slot at the top. See Figure 1.
2. Install the torque strut to frame bracket bolt and torque to spec.
3. Install the transmission bracket to the transmission. Install the double ended stud in the location shown in Figure 1.
4. Install the torque strut to transmission bracket bolt and torque to spec.
5. The oil filter drip shield lower attachment should be made to the outside of the double ended stud as per Figure 1, if so equipped.
WARRANTY INFORMATION:
Cross switch front tire/wheel assemblies
Labor Operation No.: T5243
Labor Time: .8 hr.
Vehicle Torque Steers Left - Remove shim under Torque Axis
Mount. Includes tire cross switch time.
Labor Operation No.: T5244
Labor Time: 2.2 hr.
Vehicle Torque Steers Right - Add shim under Torque Axis
Mount. Includes tire cross switch time.
Labor Operation No.: T5245
Labor Time: 1.6 hr.
Vehicle Torque Steers Right - Install Angled Rear Torque Strut.
Includes tire cross switch and adding shim time.
Labor Operation No.: T5246
Labor Time: 2.5 hr.
Swap Tires from a Known Good Vehicle - Includes cross switch time.
Labor Operation No.: T5247
Labor Time: 1.4 hr.