Maybe, a great deal, and yes.
There is no "ideal" pinion angle, it is totally dependent on the the tail shaft angle and prop shaft angle. The more weight that is added the lower the chassis will sit and change the prop shaft angle and the pinion angle. You need to wait until you have a complete driver to accurately set the pinion angle. Ultimately you want the pinion to be roughly equal but opposite the tail shaft and have driveling working angles between 1/2 and 1*.
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Dennis
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