Welcome to Hy-Tech Transmissions, in St. Louis, MO and Greenville, IL. For over 30 years we have been providing exceptional transmission repair & replacement on foreign and domestic vehicles. Hy-Tech is a family owned, ATRA certified transmission and auto repair business with more than 40 years of combined experience providing our customers with quality transmission repair work and attentive customer service.We offer a full range of automotive transmission services including:- Specialization in Automatic and Manual Transmissions- Computerized & Expert Tech Diagnostics- Diesel Transmission Upgrades: Stock and High-Performance Applications- Clutch, Manual Transmission - Transfer Cases, Drive Shaft, Differentials & 4x4 ServiceWe also provide General Auto Repair including: - Tune-ups & General Maintenance- Brake Service- Suspensions and U-Joints- Water Pumps We run a clean and well organized shop, which allows us to complete your repair quickly and correctly the first time.