1872 super garden tractor

I was backing up yesterday and lost my drive. Upon inspection, I noticed the connection between the drive shaft and the hyraulic transmission was fried. The drive shaft spins and the hydraulic pinon just sits there. One of these mates must have spun. I'm going to take it apart and have a look but my guess its the carbon steel cowling that is spun.

I'm bummed because this tractor has been good for me but this last wear problem is primarily due to the fact the differential case is losing its connection to the frame and I am getting too much movement in the transmision and drive shaft. I've tighented all the bolts I can, but the ones drilled directly into the differential case are stripped. So unless I can get the transmission secured in, fixing the drive shaft connection isn't going to last long.

Any body got any suggestions??

I have seen where over time, that some of these bolts vibrate loose, and/or come out. Thus this puts stress on the remaining attachment point(s).

The Rear Axle Carrier Bolts, as best as I can seem are a Grade 5 Bolt. Thus, you have a fairly strong bolt being threaded into an Aluminum Housing.
The proper tighten torque is important here. If these bolts are broken, one could drill and use an "easy out" to extract the broken portion. If the threads are stripped, then a close examination could be done to see if re-drilling to the next larger size and re-tap in an option. You could also find a good used rear end or rear end housing and replace that.

If you have the rear end secure and solid, then the stress of the drive line will be eliminated.

Id really like to add one of them to my colection. If Im not mistaken went they the yellow and white version of the big red 82's.