This oversized solenoid produces the extra force necessary for heavy duty applications and shifters or transmissions that are difficult to shift from first to second gear. Also, Ideal for shifters with extra long cables that make them hard to shift. This specialty unit can replace the 254-SN5000FC or 254-SN5000RC Shifnoid kit, if necessary for your application. For 2-speed transmissions using a B&M Pro Stick, Hurst Quarter Stick, TCI Outlaw, TCI Thunderstick with Front Exit Cables and Hurst Quarter Stick II with Rear Exit Cable. The all electric operation means no Co2 bottle system or bottle maintenance required. Wires into any RPM activated switch, timer or push button and the solenoid operated shifter makes your 1-2 shift. Kit includes solenoid, bracket, and relay. Hurst, B&M or TCI shifter not included.