Input Shaft - Vasco 300 GM PG w/Turbo Spline

The Input Shaft – Vasco 300 GM PG w/Turbo Spline is a precision-engineered transmission component designed for high-performance Powerglide builds and turbocharged applications. Built by ATI Performance, a leader in transmission internals and motorsports parts, this input shaft serves as the critical connection point between the engine's torque converter and the transmission's gear train. Whether you're building a street machine, bracket racer, or streetable turbo application, upgrading to a purpose-built input shaft with turbo spline geometry is essential for reliable power transfer and longevity under boost.

Manufactured from steel with a turbo spline design, this input shaft accommodates higher rotational forces and complex drivetrain dynamics inherent to turbocharged engines. The turbo spline profile enhances mechanical coupling between the shaft and driven components, reducing slippage and micro-movement under acceleration load. At 12.875 inches in length and weighing just 2.19 lbs, the shaft maintains optimal geometry for Powerglide transmissions while supporting increased horsepower and torque loads. The precision-ground spline engagement surfaces ensure consistent power delivery, while steel construction provides fatigue resistance essential for repeated boost cycles and sustained performance driving.

This component is ideal for builders modernizing classic Powerglide transmissions in turbocharged applications, small-block Chevy conversions, and motorsports platforms where factory internals cannot safely handle elevated boost pressures. Proper installation requires transmission removal and expertise in Powerglide disassembly; many builders pair this shaft with ATI Performance torque converters and transmission bearing kits for complete system optimization. Verify your transmission code and spline count before ordering to ensure correct fitment, as Powerglide variants exist across multiple GM applications. For anyone serious about reliability in a turbocharged drivetrain, upgrading input shaft internals represents foundational insurance against premature wear and catastrophic failure.