1993 GMC Forward Control 5.7 K, _NA_, CNGFACTORY OEM SERVICE PROCEDURE

Disassembly (Floor Shift)

  1. Disconnect negative battery cable. Remove steering column from vehicle. See STEERING COLUMN under REMOVAL & INSTALLATION. Remove steering wheel. See STEERING WHEEL & HORN PAD under REMOVAL & INSTALLATION. Remove shaft lock cover. See Figure . Using Lock Plate Compressor (J-23653-C), compress lock plate and pry retaining ring from groove in steering shaft. See Figure . Discard retaining ring. Remove lock plate. Remove turn signal canceling cam.
  2. Remove upper bearing spring. Remove thrust washer. Place turn signal in up (right turn) position. Remove turn signal/combination switch lever and hazard switch lever. Remove switch actuator arm screw and switch actuator arm. Remove 3 turn signal switch retaining screws. Remove steering column support bracket bolts and support bracket.
  3. Disconnect turn signal switch electrical connector. Remove 2 wiring protectors and carefully pull wiring through steering column. Remove turn signal switch and allow to hang free.
  4. Remove buzzer switch. Place key in lock cylinder and turn to LOCK position. Remove lock retaining screw, being careful not to drop screw down column. See Figure . Pull lock cylinder from housing.
  5. Remove second retaining ring from steering shaft. Remove steering shaft. Disconnect dimmer switch electrical connector. Remove dimmer switch retaining screws and remove dimmer switch. Remove dimmer switch actuator rod. Remove ignition switch retaining screw and remove ignition switch.
  6. Remove 4 steering column housing-to-steering column retaining screws. Remove column housing, gearshift lever bowl and bowl shroud assembly from column. Remove upper bearing retainer. Remove 3 gearshift lever bowl-to-column housing retaining screws. Separate gearshift lever bowl from column housing and bowl shroud from gearshift lever bowl.
    NOTE: Key release lever is under spring tension. Use care during removal so as not to lose wave washer and key release lever spring.
  7. Carefully remove wave washer, key release lever and key release spring. Remove ignition switch actuator rack and spring and bolt assembly from steering column housing. Remove spring and bolt assembly from ignition switch actuator rack. Remove switch actuator rod from actuator rack. Remove spring thrust washer from spring and bolt assembly.
  8. Remove switch actuator sector. Remove rack preload spring. Remove washer/wiper switch actuator pivot pin. Remove wiper/washer switch. Remove bearing retaining bushing from housing. Remove bearing assembly. Remove lower bearing adapter clip from bottom of steering column. Remove lower bearing adapter retainer. Remove adapter and bearing assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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