E 250 3/4 Ton Van V8-5.4L CNG VIN M (1997)
Universal Joint: Component Tests and General Diagnostics
U-Joint Phasing
When assembling a slip between center driveshaft, the universal joint yokes must be assembled to the driveshaft on the same plane. If not, the assembly
can be out of balance, causing a driveline vibration.
NOTE: Two-piece driveshafts cannot be assembled out of phase due to a master or "blind" spline located on the yoke.
U-Joint Wear
Prior to checking driveline angularity, inspect the universal joints on the driveshaft for proper operation.
Place the vehicle on a frame hoist and rotate the driveshaft by hand. Check for rough operation or seized U-joints. If the U-joint shows signs of seizure,
excessive wear or improper seating, scribe alignment marks on the driveshaft and rear axle companion flange. Remove the driveshaft and remove and
replace the U-joint. Install the driveshaft in the marked original position.
Universal Joint Flange Runout Check - Rear Axle - Circular
CAUTION: This operation disturbs the pinion bearing preload. Pinion bearing preload must be reset if the pinion nut has been loosened or removed for
rear axle universal joint flange reindexing or replacement.
1. Raise the vehicle on a twin-post hoist that supports the rear axle.
2. Remove the driveshaft.
3. Check the rear axle universal joint flange for damage.
4. Position the Companion Flange Runout Gauge on the rear axle universal joint flange.
