That’s so shitty man, it kinda looks like the driveshaft adapter at the motor failed first and took the drive shaft with it? If you wanted to take the adapter off the motor and send it to me I’ll make you another good one in the machine shop here
Yeah thats what gave out but It needs to be remade, welded, and balance is the problem. It's seams like it's a little too short. Needs to go on farther then it does on that back gear box.