Quote:
Originally Posted by lewismd71
axle shaft length makes no difference when centering the PINION with the vehicle. the pinion needs to be directly behind the transmission output or you will experience vibrations.
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The pinion center line needs to be parallel and squared to the centerline of the transmission both vertically and horizontally. It doesn't need to be in direct alignment. In a car with suspension that moves, it would almost never be in direct alignment anyway. Trying to center the axle by measuring from the pinion center to the perch to determine the final perch location is not a good idea because there are vehicles that have the engine and differential offset from the vehicle center line. The front axle you mentioned would probably back this up, as most of them have the pinion offset a great deal. By measuing out equally from the pinion, one perch would be somewhere on the tube and the other might be out in space past the rotor/drum.