Rear axle adjuster on left side??

I have taken a few apart with the adjuster on the drivers side. They were cars that never had any work done to them, nii oh t even at the dealer. Who knows it could be somebody building them screwing around. Kim

This ^^^^^^^^^^^^^^^^^^
TH stock 66 belvedere 8 3/4 I had in the old hemi car ,came w/ it on the drivers side from the factory, was there until we went w/ the dana 60 , we ran more than .017 play too.