Driveline rattles and vibrates when backing off the throttle

Sorry, with the previous post. This problem just started 10 days ago. It is perfectly smooth through all 5 gears up to 70 mph. The instant i remove throttle all hell sets in. The front shaft is good and tight. The rear is a new diuble cardon shaft. I have t installed double adjustable upper and lower joints, please what is maybe wrong?
 
First I would not even dare to be getting that thing up to 70 mph right now until you figure out what’s going on - Be sure your front and rear pinion nuts are not about to come loose and pull the front driveshaft after that and see what happens
 
Thanks, checked that a nd both drivelines, could this be a failed trans mount? I left this jeep in the black hills of south dakota so i cant check but the tranz mount came to mind
 
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