Bronco Full Size L6-300 4.9L (1987)
Propeller Shaft: Customer Interest
Driveline - Vibration/Noise at Highway Speeds
Article No.
97-13-22
06/23/97
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NOISE/VIBRATION - WHEN DRIVING IN 4X2 MODE
WITH HUBS LOCKED - 4X4 MODELS
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DRIVELINE - VIBRATION/NOISE - WHEN DRIVING IN
4X2 MODE WITH HUBS LOCKED - 4X4 MODELS
LIGHT TRUCK:
1987-96 BRONCO, F-150, F-250 LD
1987-97 F-250 HD
This TSB article is republished in its entirety to include 1996 and 1997 model year vehicles.
ISSUE:
A driveline vibration or noise may occur when driving a 4X4 truck at highway speeds in a 4X2 mode with the front drive hubs locked. This can occur if
the driveline angle is incorrect.
ACTION:
Replace the front driveshaft with one that has a double cardan joint at the transfer case and a compatible companion flange for the transfer case. Refer to
the following Service Procedure for details.
FRONT DRIVESHAFT REMOVAL
1.
Disconnect the single cardan U-joints at the transfer case yoke and the front axle yoke. Remove the driveshaft.
2.
Remove the single cardan output shaft yoke and slinger at the transfer case.
a.
Remove the 30 mm nut, steel washer, and rubber seal.
b.
Remove the yoke and slinger together.
FRONT DRIVESHAFT INSTALLATION
1.
Install the double cardan yoke on the transfer case front output shaft. Place the slinger, rubber seal, steel washer, and locknut on the output shaft.
Tighten the nut to 203-244 N.m (150-180 lb-ft).
2.
Install the front driveshaft.
a.
Position the double cardan U-joint end of the driveshaft to the transfer case front output yoke.
