Alternate Procedure

1. Road test-evaluate and record road speed at which vibration occurs.
2. Raise vehicle on a frame contact hoist. Re-evaluate by starting the engine, engaging the transmission and accelerating to the indicated speeds at which the vibration was most severe during the road test. Suspending the rear axle makes the driveling more sensitive to vibration.





3. Mark one of the driveshaft centering socket yokes mounting bolt holes A, and number the rear axle universal joint flange holes 1 through 8, starting with the one mating with A. The original position can then be identified as A-1. Re-index the shaft 180° to A-5 and road test. If not satisfactory, repeat for positions A-3 and A-7 and, if necessary, between the best two of the previous four tested until the vibration stops or the best position is found.
4. A vehicle is more sensitive to excessive imbalance or runout at the rearward end of the driveshaft; therefore, locate the heavy side of the driveshaft by using the strobe light and transducer from Rotunda Electronic Strobe Balancer 006-01400 or equivalent as follows:
a. Remove rear wheels and tires.
b. Reinstall all the lug nuts in reverse, flat side toward the rear disc brake rotor to avoid hub imbalance and to prevent rear disc brake rotor from dislodging.





c. Draw an axial chalk line at any radial location approximately 101.6 mm (4 inches) long at the rear of the driveshaft.





d. Locate the transducer on the bottom side of the rear axle housing and secure it in place.
e. Run the engine at the worst vibration speed noted and watch the position of the chalk line using the strobe light. This provides a starting point for the initial location of the clamps.
5. Stop the engine and rotate the driveshaft so the chalk line is in the same location as seen under the strobe light.





6. Install two stainless steel hose clamps on the driveshaft. Position the clamp heads 180° from the transducer and tighten the clamps.
7. Run the engine through the speed range. If no vibration is felt, remove the lug nuts, install the wheels and tires and reinstall the lug nuts in the correct position and go to Step 9.
^ However, if any vibration still exists, the combined weight of the two hose-clamp heads may be in excess. To reduce this excess weight, rotate the clamp heads away from each other approximately 15° (one each way from the original position). Run the engine and note if the vibration has been reduced.

CAUTION: Do not run the engine on the hoist with the transmission engaged for extended periods due to the danger of overheating the engine or transmission.

8. Continue to rotate the clamp heads apart in smaller angular increments until the vehicle feel of balance (vibration) is best. At this point, install the wheels and tires and road test the vehicle to determine the actual degree of improvement.
^ If satisfactory improvement has been obtained, proceed to Step 9.
9. When the balance has been corrected to a satisfactory level, tighten the clamps securely. Clean thoroughly with lacquer thinner and spray the clamps with a commercially available black paint for a finished appearance.