Got the Cub off the ground, but will need ballast on the front of the Ford. It wanted to do a wheelie, so I put the Cub back down. This will work, just needs a little fine tuning.
Another thing, once i got it up, the Ford wanted to back up on it's own. Not sure what is going on there. May need a little more tension on the centering springs for neutral.
It sounds like something may be flexing or is loose in the drivetrain. I'd have a good look at the tranny linkage, rear axle mounts and the frame to make sure it's sound.