Before replacing the bearings, the following checks should be made:
If the noise does not occur with the above checks, the noise is due to another component such as the clockspring and this TSB article does not apply. If the noise does occur, install the Upper Steering Column Bearing Kit (F6AZ-3605-AA) which includes silver plated upper steering column bearings. Refer to Instruction Sheet 7162 provided in the Upper Steering Column Bearing Kit for replacement procedure.
The Upper Steering Column Bearing Kit (F6AZ-3605-AA)
A SIMILAR NOISE CAN OCCUR AT THE TRANSFER CASE SKID PLATE ATTACHMENTS AND SHOULD BE INVESTIGATED IN CONJUNCTION WITH THIS REPAIR PROCEDURE.
YOU MAY NOTICE THE FRAME RAILS TWIST SLIGHTLY AND "RELAX" AFTER THIS NEXT STEP.
IT IS IMPERATIVE THAT THE FOLLOWING TIGHTENING SEQUENCE BE FOLLOWED.
NOTE:ON HEAVY DUTY VEHICLES, IT MAY BE NECESSARY TO UPGRADE THE REPLACEMENT FASTENER TO A 9/16" GRADE 8 TORQUE PREVAILING NUT (34990-S2) AND BOLT (58698-S2) TORQUED TO 190 ±4 N-m (140 ±3 LB-FT).
NOTE:USE WARRANTY DEALER CODING: 3B095, AS BASIC PART NO.
NOTE:IF THE BOLT IS VERY LOOSE AND THE BRACKET IS NOT CLAMPED TIGHTLY, INSPECT THE FRAME AND BRACKET HOLES FOR ELONGATION. IF A BRACKET HOLE IS ELONGATED, THE BRACKET MUST BE REPLACED. IF A FRAME HOLE IS ELONGATED, THE ENTIRE FRAME MUST BE REPLACED, OR THE FRAME AND BRACKET HOLES MUST BE DRILLED OUT TO A LARGER SIZE, NOT TO EXCEED 15mm (19/32"), AND A LARGER NUT AND BOLT MUST BE INSTALLED.
NOTE:MOST OFTEN, THE NOISE CAN BE ELIMINATED BY REPLACING ONLY THE MIDDLE RIVET OF THE THREE (3) SECURING THE BRACKET.
CAUTION:DO NOT REMOVE THE FASTENER WITH A CUTTING TORCH BECAUSE DAMAGE TO THE FRAME STRUCTURE IS LIKELY TO RESULT.
NOTE:USE WARRANTY DEALER CODING: 5A306, AS BASIC PART NO.
Inspect the rivets for looseness. Replace any loose or poorly seated rivets using the following procedure.
Inspect and retorque all axle pivot bracket bolts (torque values may vary by model - refer to the appropriate light truck Service Manual for proper torque specifications).
NOTE:IF THE BOLT IS LOOSE AND THE BRACKET IS NOT CLAMPED TIGHTLY, INSPECT THE FRAME AND BRACKET HOLES FOR ELONGATION. IF A FRAME HOLE IS ELONGATED, THE ENTIRE FRAME MUST BE REPLACED. NO FRAME REPAIRS ARE AUTHORIZED ON THESE #1 CROSSMEMBER HOLES.