![]() When better fuel economy is desired, the 0.78:1 ratio slows engine speed by 22 percent, thus reducing those wild 4.56:1 dragstrip gears to a freeway-friendly 3.55:1 ratio (when fitted to a transmission with a 1:1 top gear ratio). Thanks to the unique gear-splitting capability of its reaction planetary system, it doubles the number of pre-existing forward gear ranges with the flick of a switch, while greatly improving vehicle response at any throttle position from idle to WFO. The Gear Vendors (GV) under/overdrive unit is unique in that it bolts to an existing manual or automatic transmission with a sturdy aluminum adapter that replaces the stock extension housing. The concept of overdrive has always been closely linked with penny pinching and maximized fuel economy through a reduction in the overall final drive ratio, but until recently, few viewed it as the perfect performance enhancement. The Gear Vendors under/overdrive system basically rewrites that book. Forget everything you think you know about bolt-on overdrive units.
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