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Home >> GMC >> 1990 >> Forward Control 3.9 L >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Servicing - A/T >> Adjustments >> Neutral Safety Switch >> Transmission-Mounted Switch
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Transmission-Mounted Switch

  1. Raise and support vehicle. Loosen neutral safety switch mounting bolts. Align hole in switch lever with hole in switch assembly. Insert a 3/32" (2.5 mm) drill bit through switch holes to hold switch in Neutral.
  2. With selector lever on transmission in "N" detent position, tighten switch mounting bolts and remove gauge pin. Lower vehicle and check switch operation, ensuring vehicle will NOT start in any forward or reverse gear.
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