Astro Van M V6-262 4.3L VIN Z (1994)
Alignment: Service and Repair
Front Caster and Camber Adjustment
Fig. 1 Caster & Camber Adjustment.
CASTER & CAMBER
Before checking and adjusting caster and camber angles, jounce front bumper at least three times, to allow vehicle to return to normal "trim
height". This will prevent false readings.
Caster and camber adjustments are made by adding, subtracting or transfer of shims inserted between upper control arm shaft and frame bracket, Fig. 1.
To adjust caster and/or camber, loosen upper control arm shaft-to-frame nuts, then add or subtract shims as necessary to adjust, then tighten nuts to
specifications. After adjustment, the shim pack should have at least two threads of bolt exposed beyond the nut. The difference between front and rear
shim packs must not exceed 0.40 inch.
When adjusting caster, transfer shims from front to rear or rear to front.
The transfer of one shim from rear to front bolt will decrease positive caster.
When adjusting camber, change shims equally at both front and rear of shaft.
Adding an equal number of shims at front and rear will decrease positive camber.
When performing either caster or camber adjustment, always tighten nut on thinner shim pack first to improve shaft-to-frame clamping force and torque
retention.
