GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual




Because the shifter on most manual transmissions covered by this manual is bolted directly to the top of the transmission housing, no shifter/linkage adjustments should be necessary or possible. If shift trouble is encountered, check for a worn clutch or a damaged shifter assembly.


See Figures 1 and 2

A clutch switch is located under the instrument panel and attached to the top of the clutch pedal. Its function is to prevent starter operation unless the clutch pedal is depressed. Some vehicles may be equipped with a separate cruise control release clutch switch or the switch may be combined with the starter safety switch, depending on the model and application. For information regarding the cruise control switch, please refer to Chapter 6 of this manual.

For most vehicles covered by this manual, the clutch (starter safety) switch is bolted in position. For most later model vehicles no adjustment is necessary or possible. However, on some early model vehicles (most carbureted and diesel along with early fuel injected engines), the switch must be adjusted for reliable starter operation.

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Fig. Fig. 1: Adjustable clutch safety switch mounting-early model

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Fig. Fig. 2: Non-adjustable clutch safety switch mounting-late model

  1. Remove the lower steering column-to-instrument panel cover for access.
  3. Disengage the electrical connector from the clutch switch.

Be sure to leave any carpets and floor mats in place when making the adjustment.

  1. At the clutch switch, move the slider (A) rearward (towards the clutch switch) on the clutch switch shaft (B).
  3. Push the clutch pedal to the floor. A clicking noise will be heard as the switch adjusts itself.
  5. Release the clutch pedal; the adjustment is complete.
  7. Reconnect the switch and test for proper operation.