Neutral Safety Switch Kit

The Neutral Safety Switch Kit by Painless Wiring is a complete back-up light and neutral safety solution engineered for hot rodders, restoration specialists, and custom builders working with classic automatic transmissions. This kit addresses a critical safety and convenience requirement: preventing engine start in any gear position other than Park or Neutral, while simultaneously activating back-up lights when Reverse is selected. Whether you're installing a modern wiring harness or retrofitting a vintage drivetrain, this kit delivers reliable switching functionality across multiple transmission platforms.

This neutral safety switch kit is specifically designed to integrate with the 700R4, TH350, and TH400 transmission families—the most common transmissions in street rods, custom trucks, and restorations. The kit includes all necessary brackets and hardware for straightforward installation without additional fabrication. The switching mechanism operates on a mechanical engagement principle: as the transmission selector moves, it triggers the switch at the neutral or park detent positions, completing or breaking the circuit to the back-up lamp relay and starter interrupt circuit. Painless Wiring's engineering ensures consistent, repeatable switching action across thousands of cycles, providing fail-safe operation in mission-critical safety circuits.

Professional installers and DIY enthusiasts appreciate this kit for its plug-and-play design and universal bracket compatibility with the three supported transmission types. It's an essential upgrade for any custom wiring project where OEM safety interlocks have been removed or where modern electrical standards are being applied to older drivetrain combinations. The compact, lightweight design (0.82 lbs) allows easy mounting near the transmission without adding bulk or complicating engine bay layout. Installation typically requires minimal modification, making it ideal for both frame-off restorations and quick-turnaround custom builds.