Yes, it seems like you need to shop "the transmission" on almost anything powered with wheels.
The motor people have done amazing jobs, that with good oils, the motors now often outlast the transmissions.
so, look behind the scenes to see what's driving the wheels, be it a mower, tractor, car or truck, and compare transmission repair or replacement costs.
Keep things in perspective. My mower has the K46. It's a 2005 model with about 450 hours, mowing an acre and a half, for 14 years. I have not changed the oil in it. It does groan when cold at first start. Tuff Torq, IIRC does not sell just the minimum parts anymore. I should take it apart, clean it out, refill with 20-50 synthetic (it's hot down here), and put a pipe tap drain plug in the bottom for draining.