Extreme Duty Forward Clutch Hub Kit GM TH400, TH425, 4L80-E, 4L85-E Forged 4140 Steel Nitrited & Case-Hardened Splines Includes Bearing & Hub Features Nitrated and case-hardened splines eliminate spline wear for applications with extreme power and offroad vehicles Shifts support ...MoreExtreme Duty Forward Clutch Hub Kit GM TH400, TH425, 4L80-E, 4L85-E Forged 4140 Steel Nitrited & Case-Hardened Splines Includes Bearing & Hub Features Nitrated and case-hardened splines eliminate spline wear for applications with extreme power and offroad vehicles Shifts support from the main shaft directly to housing and sun gear shaft Case-hardened at bearing surface is removed for easy modifications to add a second bearing if needed Additional 1/4 in. thickness compared to OE will reduce endplay and provides adjustment options No machine work required for typical installationsLessview less