Mine is stamped on the tube also, so odd his isn't on either?
The shaft drive isn't that bad as far as taking apart. Let me give you a couple tips that i have discovered on these, like i said i had mine out twice, and a buddies out like three times (he was dang hard on it but has since learned through his pocket), and another one i tore out to.
All you have to do for removal is loosen the front band, the motor side, of the rubber boot for the driveshaft. The knuckle/universal joint will pull right off as you pull the motor out of the frame, its not latched or otherwise its free floating across the two shaft ends and its kept aligned with a spring thats on the driveshaft.
Now re-assembly is a pain merely because of that dang spring, it won't compress easily allowing the motor to move back far enough so the motor clears the frame in the front and drops down into place. Here is how i have got it to work twice now... Loosen the back clamp of the driveshaft boot and slide that back onto the driveshaft housing, force the boot back as far as it goes, you can get it slide back at least half its length to give you some more hand room in there. Then bring the motor in, you pull it out and put it in from the left side by tipping the top end to the left side and then just rolling it out and pull it, towards the side with the recoil and sub-trans. When you put the motor back in get it nearly all the way back in, have the knuckle/universal joint on the motors output shaft, line it up with the driveshaft and get it started. Now to get the spring to compress and the motor to slide back in the rest of the way here is how i do it faster now. Put the rear end up on jackstands, then turn the wheels by hand to rotate the driveshaft, it will spin around until everything lines up and the weight of the motor will just make it drop into place. Then start putting the bolts back in, i start with the hanger bolt and the top rear bolt to get stuff lined up.
I wont tell you its easy, its a real pain on the shaft drives, but its not as bad as breaking a stud! Got access to a impact wrench? If you do i would put it on the head of that lower motor bolt andaway till you get it to turn, once it turns then it should be easier to tap it out. You might even have to alternate between spinning it and beating on it.