I have a b1750D manual transmission 4WD and a b7100 HST 2WD tractors and I was curious to know if it's possible to make the 1750 a HST using the transmission from the 7100? I don't know if it's possible but I'm curious to know how hard it will be.
I might be wrong but pretty sure the conversion would be a non-starter. Too many trans/range gear/frame parts are different. Best plan might be to sell them both and buy a 4wd machine with HST.