No adjustment is possible on the C3 transmission.C4 and C5 Transmissions
- Place the transmission selector lever in the Neutral position.
- Raise the vehicle and support it on stands. Loosen the two bolts that attach the neutral safety switch to the transmission.
- Rotate the switch until a gauge pin (shank end of a no. 43 drill bit) can be inserted through the gauge pin holes in the switch. The gauge pin must be inserted a full 31 / 64 in. into the switch, through all three holes in the switch.
- Tighten the switch retaining bolts and remove the pin.