Patrick - the entire 2.74 planetary geartrain including sun shell, which is unique to the 2.74 set; The wide 5 clutch drum, the forward drum with shaft - the shaft can be replaced with a '78-up non-lock-up shaft; the pump can be reused in a non-lock-up application if one of the balls in the stator is removed. It is kinda tricky to remove, but can be done. The front servo is a controlled load and is not desirable. The low/rev drum is not special. John