From '39 M to '62 560/660 there are alot of design similarities but there were some significant changes made when the TA came out. Interchangeability in the transmission is severely limited on tractors before the TA and after.
As mentioned before, you can use use a Low-Low first gear on the pre TA tractors. Low-Low was not available on SMTA, 400, 450, 560, 660 because the TA made it obsolete. The kit is three gears and a new countershaft with integral gear. I think these changes also apply to the 300-460 series of tractors.
Now this is where it gets interesting. Because the six cylinder engine rotated faster than the four cylinder, IH put an altered Low-Low in that transmission as standard. The countershaft with integral gear was back. This means you can put a Low-Low into a SMTA. This is what I did. At the same time, they changed the final drive ratio. That gear set will also fit a SMTA. These two changes make it possible to create a super-slow SMTA, 400, 450; particularly first gear while in low range.
I don't think a 300 and later rear frame will go into a H. You will need to change out the center section as well to make it work. This is how you make a SHTA. I don't have as much experience with those tractors.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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