i do not know if this has ever come up before but it concerns Yukon Gear ring and pinion sets for the 742 case.
i purchased a set of 3.55's and while trying to set the pinion bearing preload , the shims used were being distorted and the preload would be all over the map.
i noticed that Yukon leaves a small radius at the shim location on the pinion gear -- factory Chrysler gears are undercut at this location so the shims sit flat to the shoulder.
once i corrected for this defect the preload...
Yukon Gear ring and pinion
