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My GV will work at about 15 MPH , but I have 4.10 gears, it's not engine RPM but driveshaft RPM that matters.
Normally an automatic transmission is set up so the GV is automatic also, but there's no reason it can't be manual. if you drop below the rpm requires the GV just shifts out it doesn't hurt it.
Wiring is simple, I used a rocker switch mounted to the gear shift, a 2 speed switch works too, so would a dimmer switch. simply supply 12V to the GV when you want it and take it away when you don't.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.