Clutch pedal vibration

[snailexpress]

Rear axle pinion angle/drive line out of specs, bad U-joints, carrier bearing, engine mounts can cause this because weakest point is clutch torsion springs. Was the old clutch torsion spring and it's slots damaged?
Rear axle spring bushing are also can play.
Anything what can move, rotate when you apply more pull force to the truck.
Some people reported bad injectors did cause vibration as well.