Mustang GT V8-4.6L SOHC VIN X (1998)
8. Remove the vehicle from the hoist and perform road test.
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 driveline more sensitive to vibration.
3. Mark one of the driveshaft centering socket yoke 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 and/or runout at the rearward end of the driveshaft. 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 wheel hub bolt imbalance and to prevent rear disc brake
rotor from dislodging.