B4000 V6-4.0L SOHC (2005)
road tested.
If the marks are on opposite sides of the propeller shaft, the yoke or rear companion flange is responsible for the vibration.
When replacing a rear companion flange, the propeller shaft runout must not exceed 0.89 mm (0.035 inch). When runout is within limits, recheck
for vibration at road speed. If vibration persists, balance the propeller shaft.
7. To balance the propeller shaft, install one or two hose clamps on the propeller shaft, near the rear. Position of the hose clamp head(s) can be
determined by trial-and-error.
8. Mark the rear of the propeller shaft into four approximately equal sectors and number the marks 1 through 4. Install a hose clamp on the propeller
shaft with its head at position No. 1.
Check for vibration at road speed. Recheck with the clamp at each of the other positions to find the position that shows minimum vibration. If two
adjacent positions show equal improvement, position the clamp head between them.
9. If the vibration persists, add a second clamp at the same position and recheck for vibration.
