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1740 Adapter plate and drive shaft

Kc Savage I got this 1740 a couple of years ago. First I love this machine. Amazing engineering and yet no degree in electronics needed to work on it. Yea parts can be expensive and a little scarce. But hay this thing does every thing I expect of it and then some.
I have been noticing some excessive vibration in the drive line, needed to finish a small project so I have been keeping the RPM's low to prevent the vibration. Wasn't sure if it was coming from the Adapter Assembly drive plate ( p# D64523 $1,300 ouch ) or the rear end yoke that hooks up to the gear box. The variable drive speed control had been leaking also so thought it would be a great time to get familiar with this repair. I already had purchased the kit for the vari-drive. Got the parts off and the adapter plate is loose in every way possible and the bearing end of the front end yoke is a little beat up. The other end yoke looks a little worn but seems serviceable.
So now to my question.
I can have a solid adapter plate made for about $650 including a new front end yoke. Has any one tried this and what problems would going rigid create? I notice that the 1737 has a solid front yoke. I wonder if that can be adapted to this application?
Whew that was a lot of words. Any input would be appreciated

AJ Looking at the parts layout I seen that the engine is on rubber mountings and the transfer box is bolted on solid to the frame,I would make sure the engine mountings are good,it would be more then likely that the vibration is caused by the U/J's on the shaft than the adapter plate,I would replace the two U/J's and see if the vibration is gone before changing the adapter plate,if the adapter plate is a flexible type that would not be used unless it was needed,check the mountings and replace the two U/J's Case # T40106 Kit and see how it is.

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