Winters Performance Products was founded back in 1958 and has been a leader in transmission and driveline innovation ever since. Winters Performance Products’ famous quick-change rear-ends have been around since the 1950s, and its “live axle” sprint car rear-end revolutionized circle track performance in the 1980s. Today, you can find Winters Performance Products in NASCAR Sprint Cup cars, Outlaw Sprint Cars, dirt and pavement modifieds, dragsters, pulling tractors, and more. Bring the rich heritage and proven performance to your race vehicle with our line of Winters Performance Products rear axle assemblies, quick-change assemblies, quick-change gears, and more!