Pinion Angle/Tailshaft Bushing

The pinion angle is only ever close at one level of power input. Whn you are off the gas it is one number, and when you are launching with maximum traction the springs could be all wound up and the pinion angle is g-o-n-e thru the roof.At all power and traction settings in between, the pinion angle will be between these extremes. With a sprung axle, there can be no one perfect angle
BTW, don't forget, the driveshaft may also not be parallel to the centerline of the vehicle,lol.