Suncoast Converters 300M Input Shaft OEM Diameter - 4140 HT L/W Steel FWD Drum w/ Aluminum Piston 406007

GM TH400 - OEM Diameter - 300M - 4140 HT L/W STEEL FWD DRUM W/ ALUM PISTON. ATI Racing Torsional Input Shafts work like a torsional spring bar, twisting and returning to totally eliminate breakage while reducing shock loads to the gear train. Designed to fit either the Powerglide or TH400 splines, these shafts are available for V8 and 6-cylinder carriers. In addition to our precision-machined torsional shafts for PG, TH350 & TH400, Ford C-4, C-6 and AOD, we offer special extreme-duty models for the PG and TH400 made of Vasco steel. This material is exceptionally strong and resilient to withstand the most severe torsional shock.