4spd trans linkage help needed

Well gents, I collected all the correct parts that you suggested (A-body clutch fork, pivot arm, z-bar to fork rod) and had a local transmisison shop that everyone recommended install them. They called and said that they got all the new part installed and adjusted so that the 4 spd shifts well thru the gears, but the car is still have the knocking nosie when you are not accelerating and are in gear. As soon as you push in the clutch the noise stops. The tranny shop isn't sure what the problem might be. When the car is not in gear and is free wheeling there isn't any knocking noise. There isn't any knocking noise when it is up in the air without weight on the driveline and it is in gear. They said that the RAM clutch is worn a little and the flywheel appears to be fine (not cut down). Perplexing to them and I. They thought maybe it could be something in the rearend. I hope not because I just installed a 3:55 posi that was taken apart and said to be good. To me, the knocking noise sounds like it's coming from the transmission tunnel. Any suggestions would very much appreciated!

Thanks in advance,

Jason
[email protected]
614-946-3333