First off, the trans broke Saturday night at Choccolocco Mountain where we worked for an hour tying your motor back to the frame.  The motor was completely loose when we started.  We left from there, downhill to camp and did not ride again.

The drive shaft was a freak, or perhaps installed too loose, or to tight, or stretched U-bolts.  I would not dwell on that.

Here is what I would do to get back on the trail the fastest and cheapest.  But, probably not best practices.

Put new caps on **IF** the cross is perfect.  Put in new U-bolts.

Buy the same style motor mounts and use large washers to keep the possibility of bolts pulling through again out.  Putting the washers in the kit in the right place this time.

I would not change the rubber blocks on the front Altas mount as they are rubber mounted on the ends.  My opinion is that part (Atlas) did not move, motor did.  Trans case broke.

I would take to to a great tig welding place and see if they will weld the case.  As it did not break through the bolt holes, at lease the ones we can see.

Put it back together and don't follow me any more 

Couple hundred dollars and back on trail for Stony Lonesome Hardline Ride in two weeks.

*OR*  think off all the right and wrong ways to do it, smoke reefer, re-do all the mounts, smoke reefer, re-built the transmission, smoke reefer, install everything, smoke reefer, dwell that you did not do it right, smoke reefer, take apart, smoke reefer, decide it was okay after all, smoke reefer, put all back in, smoke reefer.  You are going to miss the Christmas rides.