E 150 Van V8-351 5.8L VIN G 2-bbl (1984)
1.
Make sure the driveshaft runout does not exceed .035". Refer to the Light Truck Shop Manual, Section 18-01-8.
2.
If runout exceeds .035", install a new driveshaft. Refer to the driveshaft application chart on page 49 of this TSB for the correct service part
number.
3.
Make sure the drive shaft U-joints are not worn. Check for a hard to move U-joint or a U-joint that catches when moved from side to side.
NOTE:
If it is necessary to replace a U-joint, refer to the following "Road Test" procedure to make sure a driveshaft imbalance is not caused by the
U-joint replacement.
4.
If the U-joints are okay, mark the driveshaft-to-axle flange with paint to aid in re-indexing.
5.
Remove the driveshaft from the axle flange and re-index 180 degrees.
6.
Road test the vehicle.
NOTE:
If the noise and vibration are still present or not acceptable, proceed to the "Road Test" procedure below.
Road Test Procedure
1.
Select a road where the vehicle can be safely operated at speeds from 25 to 65 MPH (40 to 105 km/h).
2.
Slowly accelerate from 25 to 65 MPH (40 to 105 km/h) and observe the speed where the noise and vibration occur. Carefully watch the 35 to 45
MPH (56 to 72 km/h) range.
3.
Shift into neutral at 65 MPH (105 km/h) and coast down to 25 MPH (40 km/h) noting at what speed the noise and vibration occur.
^
If the noise and vibration were not present during coast down, the NVH concern is not with an imbalanced driveshaft.
^
Vibrations during a neutral coastdown from 65 to 45 MPH (105 to 72 km/h) indicate an imbalanced driveshaft and/or imbalanced wheel and
tire assemblies.
^
Vibrations from 35 to 45 MPH (56 to 72 km/h) indicate an imbalanced driveshaft.
^
Vibration from improperly balanced wheel and tire assemblies are normally FELT in the steering wheel and seats and do not have body
"boom" noise associated with it. If this is the case, balance all four (4) wheel and tire assemblies.
