The solid input shaft from Santjer Performance is larger, stronger, and without the inherent lube port stress concentration weakness of the stock shaft design. It's able to deliver these benefits without compromising fluid transfer rate; an issue common to larger shafts that reduce port diameters for slight strength increases. Direct hub spline length has also been increased for additional clutch capacity. Torsion tested in excess of 4000 ft-lbs without failure, the solid input shaft uses a proprietary heat treatment and ultra-high strength VAR alloy. Now available in TrackMaster Transmissions, with Solid Shaft ready Hi5 or ProForce 3D torque converters. FEATURES Designed for the transmission builder Torsion tested in excess of 4000 ft-lbs without failure High stressed points at fluid ports and sealing ring grooves are eliminated 1-3/16 diameter 37-tooth involute spline geometry Cold formed / rolled splines for superior fatigue properties Uniform material grain flow generated during the forming process Proprietary heat treatment and ultra-high strength VAR alloy Increased shaft length for improved torsional dampening Increased bearing support surface area Increased direct hub spline length for additional clutch capacity Ultimate fluid transfer flowrate, to and from the converter with reduced restrictions common to other large shafts Comes with pump stator support assembly Must be used in conjunction with the Hi5 or ProForce 3D multi-disc Solid Shaft capable converter NOTE Must be used in conjunction with the Hi5 or ProForce 3D multi-disc Solid Shaft capable converter VIDEOS Santjer Solid Shaft. Is it worth it?