Need a drivetrain guru!

So… hoping someone is on here who really knows drivetrains. When i change up gears i get clunk/thud as the power comes in. Really hard to feather it away. Same if i let off throttle suddenly. Some kind of loose play and most concerning. Not mounts as these are all checked. Hoping its not the gearbox. Forum, do your thing!
Cheers
 
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