4. Engine removal isn't required to do the transmission conversion, but we took the opportunity to pull the motor at the same time and do some cleanup and detail work under the hood. By working outside the car, we provide a clearer picture of putting the engine, bellhousing, and T5 back together. Of course, having access to a hoist to do any transmission R&R work is always helpful. Removing the 351W and Top Loader four-speed from this '69 Mustang was relatively easy with the right equipment, such as the aforementioned hoist and an engine hoist. With two people working, the engine and trans were out in about three hours.