SLIGHT TORQUE STEER ON ACCEL NEW SERVICE PARTS & PROCEDURE

Subject: SLIGHT TORQUE STEER ON ACCELERATION (NEW SERVICE PART)

Models Affected: 1991-92 BONNEVILLE MODELS

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 on the following page. 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.

Bonneville 1992 Start of Production thru N1242975

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

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.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.