Details FAST-FLASH™ Part # 170383 - Works with: 96-97 GM Gas Trucks w/ 4.3, 5.0, 5.7, 7.4 - Auto/5 Speed Manual Transmission - CK1500, 2500, 3500/S10 FAST-FLASH™ Power Programmers give your vehicle a 15 minute tune-up that unlocks hidden performance potential, yielding maximum horsepower and torque. The process is simple – just plug the programmer into your vehicle’s under-dash ODBII port, and answer a few questions. Select from three distinct modes (performance, towing or economy), and FAST-FLASH™ automatically reprograms your vehicle’s computer for idle quality and optimized air/fuel ratios. It also re-calibrates the ignition timing, transmission shift points and the speedometer for gear and tire changes