February 2021 The heavy-duty truck chassis came with a special rear differential with lower gearing than the normal car and truck, giving more pulling power but a lower top speed the frame is also stronger; the cab and engine are the same.
While this is a relatively minor change, the parts between the third and fourth generations are not interchangeable.
They were 21 in × 4.
The right foot pedal applied a band around a drum in the transmission, thus stopping the rear wheels from turning.
Dozens of companies sold kits to facilitate the T's conversion from car to tractor.
The previously mentioned parking brake lever operated acting on the inside of the rear brake drums, which were an integral part of the rear wheel hubs.