You have to have the flex disc at the tranny end if you still have the iso mounts. That engine is going to move and you have to account for it.
I think if you redo the iso mounts and the driveshaft at the same time you should be back to good.
It lasted a long time the first time around and it should last a long time again.
Randy
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2 original cub cadets 
1 100's
2 149's
1 73
1 2182
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