Lucked out this week and found a 1933 T45HD that was stored inside most of its life. This was a one year model and the prototype of the D-Series tractors. It replaced the T45HW and was about $80.00 less in price. The T45HW was a good tractor, the first Shaw with all enclosed gearing, but it was just too expensive to manufacture.
The T45HD used the Ford model A transmission, same as the HW, but high gear was locked out as it was too fast. This was corrected with the 1934 model T45D which replaced the HD as an internal gear reduction was added to the front of the A transmission. The differential was a system of ratchets in each wheel. Four inch pyramid lugs were standard. No provision to drive a cutter bar was offered.