I have a 79 Z with a Super T10 transmission. I've had some rattling issues when taking off easy which I eventually found to be where the wheels were bouncing around in the back like a basketball causing my leaf springs and everything else to move. I had a shop look at it and they are saying that the driveshaft yoke is too short and is causing this. It appears to have the stock size of 6 1/2 inch. The car has a 12 bolt rear end and I have no idea if this is even the right size driveshaft. Questions are: 1. Would a short yoke cause this take off issue which really seemed to me to be like clutch shudder. 2. Would getting a longer Yoke work or should I look at a longer driveshaft? Thanks in advance!