Ascender 4WD L6-4.2L (2003)
Steering Shaft: All Technical Service Bulletins
Steering - Steering Column Squeak/Rubbing Noise
TSB SBO3-06-SOOI
Squeak RubiScrub Type Noise in Steering Column (Lubricate
Upper Intermediate Shaft Serration (Slip) Joint...)
Squeak, RubiScrub Type Noise in Steering Column
(Lubricate Upper Intermediate Shaft Serration (Slip)
Joint and Remove Material From Upper Intermediate
Shaft Bushing)
Affected Vehicles
2003 Ascender (US) vehicles built prior to VIN breakpoint 32214010 (Moraine, OH) and
36170447 (Oklahoma City, OK).
Service Information
Condition: Some customers may comment on a squeak noise coming from the steering column while turning the steering wheel. Some customers may
also comment on a rubbing/scrubbing type noise/feel in the steering wheel during low speed turns/parking maneuvers. This condition may be more
pronounced in cold temperatures.
Possible Cause: Inadequate distribution and amount of grease in the serration (slip) joint of the upper intermediate shaft may cause the squeak noise. The
rubbing/scrubbing type noise may be due to an interference fit between the upper intermediate shaft boot seal and the intermediate shaft bushing.
Correction :
Lubricate the upper intermediate shaft serration (slip) joint. After lubrication, remove material from the upper intermediate shaft bushing.
Follow the Service Procedure.
Service Procedure
1.
Remove the two screws that retain the left closeout/insulator panel to the instrument panel (IP).
2.
Release the insulator panel-retaining clip from the IP substrate and lower the panel.
3.
Remove the pushpin retainer and the LH floor air outlet duct from the heater module.
4.
Insert the flexible applicator hose of the spray lubricant, P/N 8-12346-293-0, through the top, hollow end (1) of the intermediate shaft
(see figure 1).
5.
With the applicator hose down as far as possible toward the mating area of the serrations; spray a generous amount of grease.