R 30 P/U 2WD V6-262 4.3L (1987)
Alignment: By Symptom
Technical Service Bulletin # 89T722
Date: 890601
Alignment - Front Axle Offset or Apparent Dog Tracking
GMC NUMBER:
89-T-72
GROUP:
2 - Frame-Bumper Sheet Metal
DATE:
June, 1989
CORPORATE
NUMBER:
962003
SUBJECT:
FRONT AXLE OFFSET OR APPEARANCE OF DOG TRACKING
MODELS:
1987, 88 AND 89 V1, V2, V3
The front axles in the 1987, 88 and 89 V1, V2, V3 models are wider than the rear axles. Due to a stack up of tolerances, the rear aide may also be offset
to one side or the other when compared to the front axle. This can be as much as 44mm (1-3/4") on the V1 and V2 models, and as much as 57 mm
(2-1/4") on the V3 models.
Because the front and rear axles are parallel to each other, this condition will not affect tire wear or vehicle handling.
Technical Service Bulletin # 883795
Date: 881201
Brakes - Pull While Braking
Number:
88-379-5
Section:
5
Date:
DEC., 1988
Subject:
LEAD WHILE BRAKING
Model and Year:
1984-86 K 1-2 1987-88 V 1-2
TO:
ALL CHEVROLET DEALERS
A condition described as directional lead (either right or left) while braking may be addressed on the models listed above by careful inspection,
adjustment or repair of the vehicle's tires, suspension, steering or brake components.
The following procedures have been developed to systematically address the area(s) that should be inspected and adjusted.
Evaluation of a vehicle's brake performance is not intended to be made with the vehicle operator's hands removed from the steering wheel. Vehicles that
exhibit directional bias under these conditions are not considered to exhibit brake lead.
Before road testing the vehicle, perform the following services:
NOTICE:
Follow the service procedures in the 1988 Light Duty Service Manual unless noted differently.
Preliminary Inspection:
^
Inspect tires for excessive, uneven wear - replace if necessary
^
Equalize tire pressures.
^
Torque leaf spring-to-axle U-bolts to high limit of specification (150 ft.lbs. or 203 N-m). See Section 3C for tightening order.
^
Equalize parking brake adjustment.
^
Adjust rear service brakes to .030" running clearance.
^
Inspect and record front end alignment readings - adjust total toe to specifications (.0 " to .14 ").
Inspect caliper brake line bolt (# 34, page 5A8, Figure 4, 1988 Service Manual) for mislocation of orifice. The orifice should be located in the
unthreaded part of the bolt. If the orifice is located in a threaded portion of the bolt, then the bolt must be replaced.
NOTICE:
After the preceding inspections and/or adjustments have been made, the vehicle should be road tested to determine if a lead still exists.
Vehicles that lead may lead either right or left when the brakes are applied.
Make all stops on a dry, level (no crown), clean roadway.
IMPORTANT!
Each applicable step must be thoroughly completed to effect a lasting repair. Failure to complete the procedure exactly as written may result in an
