TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline These MidAir Series Manifolds includes

These MidAir Series Manifolds includes a 4150 Series 1200 CFM Billet Throttle Body

they replace your existing worn or damaged valve guides

while increasing your engine performance

They are welded from high quality steel with performance screens

and then nitrided for durability

TH400 Extreme Duty Forward Drum & 300M Input Shaft 35-Spline These MidAir Series Manifolds includesTake 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.