Truck Dana 60

So just move the pinion to the right a inch or so I understand
Im just not fully understanding why exactly
Other then rotating the needle bearings in the u-joint
But I'm sure "cass" will line me out


I asked the same question to a guy that builds axles at the Mopar Nationals. His reply was that he had talked to a Chrysler engineer and he told him that the reason it was offset was to preload the pinion.