Description
LMMF 3100 / 3400 Extended Crank Sensor Harness
Stronger wiring. Cleaner setups. More flexibility for your build.
Upgrade your ignition system with the LMMF 3100 / 3400 Extended Crank Sensor Harness. It is designed to replace brittle factory wiring while providing the extra length needed for coil pack relocation and cleaner engine bay layouts.
Factory crank sensor wiring is often one of the most failure-prone sections of the harness due to heat, vibration, and age. This upgraded harness eliminates those weak points. It does so by replacing the old wiring with new, durable wire and high-quality connectors. This helps ensure a stronger and more reliable ignition signal.
The extended-length design gives builders more flexibility when relocating coil packs or organizing wiring. This is especially useful during engine swaps, derby builds, or performance setups.
Key Features
1. Extended Length Wiring
Provides additional wire length for easy coil pack relocation and cleaner routing.
2. Replaces Brittle Factory Wiring
Eliminates aging factory crank sensor wiring that can cause ignition issues or intermittent engine problems.
3. Built with New Wiring and Connectors
Constructed using brand-new wire and durable connectors for improved reliability.
4. Plug-and-Play Installation
Simple installation with no complicated wiring modifications required.
5. Built for Harsh Environments
Designed to withstand the heat, vibration, and abuse common in race and derby applications.
Perfect For
• Demolition derby builds
• Engine swaps
• Performance builds
• Custom coil pack relocation setups
Built for Reliable Ignition Performance
Whether you’re cleaning up an engine bay, relocating your coil pack, or replacing failing factory wiring, the LMMF 3100 / 3400 Extended Crank Sensor Harness provides a dependable solution. Notably, it is designed for real-world racing and derby environments.
Pro Tip: Pair this harness with a simplified engine harness and custom ECM tune for the cleanest and most reliable ignition setup.
Be sure to check out our ECM / Ignition, Battery Boxes, and other electrical components at DerbyParts.com. Explore our site to complete your build. 🔧










