Driveshaft Runout and Balancing

the source, compare the 2 high points previously determined.

1. If the index marks are close together, within 25 mm (1 in), the driveshaft is eccentric. Install a new driveshaft.

2. If the marks are on opposite sides of the driveshaft, 180 degrees apart, the slip yoke or pinion flange is responsible. Check the pinion flange runout. If the pinion flange runout exceeds specifications, a bent pinion is indicated.

3. If the pinion flange and pinion runouts are within specifications, road test and check for the vibration at the road test speed. If the vibration persists, balance the driveshaft. Refer to Driveshaft Balancing in this procedure.

Driveshaft Balancing – Using the Mastertech® Series MTS 4000 Driveline Balance and NVH Analyzer (Vetronix)

4. Special Tool(s): Mastertech® Series MTS 4000 Driveline Balance and NVH Analyzer (Vetronix) 257-00018. Working under the vehicle, install an accelerometer. The accelerometer can be attached and mounted near either the transmission or differential end of the driveshaft.

5. NOTE:

Clean an area of the driveshaft and install the reflective tape, then install the photo-tachometer sensor. The sensor should be placed at approximately a 20-degree angle from perpendicular to the surface of the reflective tape. Make sure the sensor does not get moved during the balance procedure.

1. Reflective tape.

2. Photo-tachometer sensor.