FRONT END ALIGNMENT REVISION POST OFFICE VEHICLES

Model and Year: 1987-90 POSTAL VEHICLES (LLV)

Some of the above postal vehicles are experiencing excessive front tire wear. To alleviate this problem, and reduce tread wear, the following revised camber and toe-in specifications (see table 1) have been developed.

INSPECTION BEFORE ALIGNMENT

Before making any adjustments affecting caster, camber, or toe-in, the normal front end inspections should be made. (Refer to Section 3 of the Light Duty Service Manual.)

IMPORTANT: Tires should be checked for proper inflation (50 psi is the specification of the LLV). Due to the severe duty cycle of the LLV a 3 month or 5,000 mile rotation is recommended. (See Figure 1.)

Vehicles Built after the following VIN are set to the new alignment specifications:

1GBBS10E9K2312849

TABLE 1 SPECIFICATIONS

TO SERVICE SERVICE ALIGN (A) CHECKING SETTING

CASTER + 2.0 DEG +/- 1.0 DEG + 2.0 DEG +/- 0.50 DEG (C) (B)

CAMBER - 0.4 DEG +/- 1.0 DEG -0.2 DEG +/- 0.50 DEG (C) (B)

TOE-IN (DEGREES- - 0.10 DET +/- 0.10 DEG -0.10 DEG +/- 0.05 DEG PER WHEEL) (D) (C)

NOTE: Vehicle must be jounced three times before checking alignment to climi- nate false geometry readings.

(A) Front suspension (Z) dimension and rear suspension (D) dimension are held as indicated in "Trim Height Specifications." Front end alignment specifications are indicated on this chart.

(B) Left and right side to be equal within 0.50 degree.

(C) Left and right side to be equal within 1.0 degree.

(D) Toe-in left and right side to be set separately per wheel and steering wheel must be held in straight ahead position within + 5.0 degree.

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.