K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Figure 6
To check the ball joints for vertical looseness:
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With front of vehicle supported, position dial indicator with magnetic base on frame and measurement needle on top of the upper ball joint or
control arm (Figures 5 and 6).
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With a pry bar, pry between the upper control arm and steering knuckle while observing the dial indicator (Figures 5 and 6). If the reading is
more than 1 mm (0.040 inch) for a maintenance free ball joint or 2 mm (0.080 inch) for a greaseable ball joint, replace the ball joint.
NOTE:
Do not pry in such a manner that the ball joint seal is contacted. Damage to the seal may result.
BALL JOINT WEAR SPECIFICATIONS
Type
Wear Specification
Maintenance Free
1 mm (0.040 inch) vertical
Ball Joint
movement
Greaseable Ball
2 mm (0.080 inch) vertical
Joint
movement
