Sonnax Industries was founded in 1978 in Bellows Falls, VT. The company is a leading manufacturer of transmission parts for nearly every automobile make and model. The company's line includes valve body boost valves, transmission tools, high performance servos, Torrington bearings, billet drums & shafts, just to name a few. Sonnax also produces a full line of shift correcting kits, under the Zip Kit, The Sure Cure, Performance Pack, and Line Pressure Booster Kit lines. Sonnax is a company that is recognized and recommended across the entire industry.