Hello All, Looking for some advice...I'm running a 56 F100 with a 223 and 3 three on the tree. I had the flywheel turned, installed a new clutch and pressure plate, installed a new drive shaft, and rebuilt and installed a 3 speed overdrive. It's been running very well since, but I have this recurring, very violent vibration or chatter occasionally when releasing the clutch for 1st gear. With very high RPMs or very slow release when engaging the clutch i can avoid the issue. Would any one have any thoughts as to what the source of the problem might be?