Reply to "Clutch Vibration ??..."

Also sometimes, one or both halfshafts are separated during ZF removal and misassembled when the clutch job is finished. If either of the two u-joint crosses in either halfshaft are NOT dead-in-line, the car will shake like a wet dog under power.
Second, if any of the 16 bolts that hold the halfshafts to the inner & outer stub axles are even slightly loose, the car will vibrate under acceleration.
And to expand on Quikitty's post. there are TWO balance factors that Ford used: the one you need with a '71-74 Cleveland is a 26-inch-ounce factor in BOTH the harmonic balancer and the flywheel. After 1982, Ford went to a 50-inch-oz factor: twice the weight-offset. If you have a mix of early and late rotating parts, this can easily cause your problem. What Pantera vendor did the parts come from?