I don't see how being unlevel would make it vibrate. They do have different thickness of the rubber motor mounts to level up your engine .
Sounds more like you may have the wrong torque converter in there. Or the engine itself is out of balance.
My thought was, I need to get the engine level before I can take accurate measurements of the tailshaft angle in relation to the pinion. I don't think it's the engine, since I've had it running and driving, albeit, with the old 904 and worn out everything else. Lol. I have a "built" converter on the way, I was going to do that anyway, just not as soon, but I figure might as well.
