Gear Vendors Under/Overdrive

Most auxiliary transmissions are just dual ranges ??? low gear for towing and high gear for running empty. Gear Vendors Under/Overdrive is built for gear-splitting (giving you a progression of gears with half the drop in rpm) so you maintain power with close ratio performance. Gear Vendors is the only auxiliary transmission that permits shifting under any throttle condition. After it???s installed, your vehicle will have twice as many underdrive ratios plus 3rd-direct and an overdrive gear (3rd-ove