If you’re putting serious horsepower to the pavement, your transmission has to be bulletproof. And at the center of it all? The input shaft—the first piece to take the hit when you stomp the throttle. A weak one will twist, crack, or flat-out snap under pressure. But ATI Performance Products builds input shafts that don’t just survive—they thrive under extreme conditions.

ATI doesn’t cut corners when it comes to strength. Their input shafts are crafted from 300M billet steel and Vasco material, both known for their ability to handle extreme stress without flexing. These aren’t your average off-the-shelf parts—they’re engineered for racers who demand the best.

For Turbo 400 applications, ATI offers a 1-inch Vasco input shaft, designed to take abuse without breaking a sweat. Need even more durability? The 1.125-inch Vasco input shaft comes with a 4140 heat-treated steel forward drum and an aluminum piston, making it one of the toughest setups available.

Slippage steals horsepower, and when you’re chasing every last bit of performance, that’s unacceptable. That’s why ATI developed Lock-Up input shafts to eliminate slip completely. According to ATI, “ATI’s welded Outlaw Lock-Up Converters provide 0% slip for up to 2800 HP while the Bolt Together Lock Up Converter will provide 0% slip all the way up to 4500HP.” That means every ounce of power makes it to the wheels.

For those looking for a complete upgrade, ATI offers Super Pump and Vasco input shaft kits. These ensure perfect alignment, optimized fluid flow, and unmatched durability, especially in high-horsepower Turbo 400 transmissions.

Bottom line—when you’re pushing big power, a weak input shaft isn’t an option. ATI’s input shafts are built to take the punishment of hard launches, high-rpm shifts, and extreme torque loads. Whether you’re upgrading a street-strip transmission or building an all-out race car, these input shafts deliver the reliability you need.

If you’re serious about performance, an ATI input shaft isn’t just an upgrade—it’s a necessity.