Muncie rebuild experts

[Bill Rose]

I have a question for the Muncie pro's. First a little history: I had my Chevelle M20 completely rebuilt by a very reputable Muncie guy in Philadelphia . I'm not 100% sure exactly what was done, but it wasn't cheep, and the end result isn't good.

Here's what it does. It seems to take off in 1st gear with no issues, but when I shift it into 2nd, the whole drive train starts shaking real bad. It also does this in 4th gear, but 3rd seems to be better.

Here's another way I can describe it: I can sit in the car, in the garage, with the motor (stock 396) idling at 900 rpm, push the clutch in, and stick it into 4th gear, and hold on!! The whole trans starts to shake, without even letting the clutch out. It does the same thing in second gear. Any suggestions? The trans will be going back to the builder, but I'd like to know what I'm talking about, when I walk into the trans shop.