T173101 Input Shaft Fits John Deere 450G LT & LGP, 550G after s/n 770862, 650GOne New Aftermarket Replacement Input Shaft Fits John Deere 4000 Series Winch Crawler Dozers This aftermarket replacement input shaft is Fits John Deere 4000 Series Winch used on G series crawler dozers. The input shaft is a critical internal drivetrain component within the PTO driven 4000 Series winch assembly, transmitting rotational power into the winch gear train. Failure or wear of the input shaft results in loss of winch function, making this a