GM Corvette 1963-1982 Repair Guide

Neutral Safety Switch

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ADJUSTMENT 1963-65 Powerglide Transmissions



Adjustment is made by varying the length of the bellcrank-to-switch control rod. One end of the rod has a swivel to allow adjustment.

1966-67 Powerglide and 1968-71 Turbo Hydra-Matic 400 Transmissions

In all models the adjustment is made with the shift lever in Drive position. Loosen the switch mounting screws. Align the slot in the contact support with the hole in the switch and insert a 3 / 32 in. pin to hold the support in place.

The shift control lever must be disconnected from the control rod and the shift control knob removed. Then remove the trim plate to get at the switch. Proceed as described in the first paragraph above, then place the contact support drive slot over the drive tang. Tighten the switch mounting screws, then remove the pin. Reinstall the shift control lever and trim plate.

1972 Turbo Hydra-Matic 400 Transmissions

  1. Disconnect the shift control lever arm from the control rod.
  2.  
  3. Remove the shift knob.
  4.  
  5. Remove the trim plate.
  6.  
  7. Remove the control assembly retaining screws and lift the assembly away from the seal.
  8.  
  9. Remove the neutral switch from the control assembly.
  10.  

To install:
  1. On early 1972 models put the shifter into Drive or Neutral on later models.
  2.  
  3. Align the hole in the contact support with the hole in the switch and insert a 3 / 32 in. pin to hold the support in place.
  4.  
  5. Place the contact support drive slot over the drive tang and tighten the switch mounting screws. Remove the pin.
  6.  
  7. Install the control assembly mounting screws. Connect the switch wiring and check the switch operation.
  8.  
  9. Install the trim plate and shift knob.
  10.  
  11. Connect the shift lever arm to the transmission control rod.
  12.  

1973 and Later Models

Use the 1972 THM 400 procedure outlined previously except that during installation, the shift lever is positioned in Drive. It is only necessary to use the 3 / 32 in. pin for alignment when the original switch pin has been sheared off.

 
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