TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline These durable output shafts can

These durable output shafts can withstand power level increases in high-horsepower vehicles

If it has to seal right the first time Speedmaster has what you need

They're so tough

Speedmaster axles are manufactured using cutting-edge technology and techniques

TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline These durable output shafts canTake your GM TH400 transmission to the next level with this premium heavy duty forward drum and 300M input shaft combo. Engineered for high power street, strip, or off road use, this kit addresses the critical failure points of stock components with a focus on strength, precision, and reduced rotating mass.