Astro Van L AWD V6-262 4.3L VIN W CPI (1992)
suppoded at curb height.
2.
For reference, mark the propshaft at 90 degree intervals (four locations) with white paint or chalk. These marks will be used for the strobing
function.
3.
L-vans only: remove the front propshaft.
4.
M/L vans: remove the rear tire/wheel assemblies and brake drums.
5.
Inspect the propshaft and U-joints for undercoating. If undercoating is present, it must be removed.
6.
Measure the runout on the rear propshaft and companion flange. There must be no more than 0.025 in. (0.63 mm) runout on the rear propshaft and
no more than 0.015 in. (0.38 mm) runout on the companion flange.
7.
Inspect the rear propshaft and U-joints for any possible damage.
8.
If the runout IS UNACCEPTABLE AND/OR THERE IS DAMAGE, call Chevrolet Technical Assistance for further instructions.
If the runout IS ACCEPTABLE AND THERE IS NO DAMAGE:
a.
Use EVA to system balance the rear propshaft to the rear axle by attaching the accelerometer to the bottom of the pinion nose with the word
"UP" facing UP.
b.
Clip the inductive pickup of an inductive type timing light to EVAs timing light loop and connect the timing light to a 12 volt source.
c.
System balance the rear propshaft to the rear axle using the instructions contained in the Electronic Vibration Analyzer Manual in Appendix
Three.
CAUTION:
DO NOT USE THE CRUISE CONTROL TO MAINTAIN A STEADY SPEED.
IMPORTANT:
DO NOT depress the brake pedal with the rear brake drums removed.
9.
Road test the vehicle. If the vibration is not noticeable, the vehicle is repaired. If the vibration is still present, contact Chevrolet Technical
Assistance for further instructions.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
Labor Op.
Description
Labor Time
T1860
Road Test
Actual Time up to 0.9 hrs.
T7338
Rear Propshaft Runout Check
0.2 hrs.
