swapping out ring and pinion 7 1/4

There were no adjusters in the housing in my 1965 Dart. I know this because I cleaned out the inside of the axle tubes with some gasoline and a toilet brush attached to a piece of pipe. Also the bearing caps did not have the threaded hole for the adjuster locks. There was also no mention of them in the 65 Factory Service Manual.

It sure would have been easier to get the backlash and preload set correctly with those adjusters.

I'd be curious to know what year the adjusters were added. And also to know if differentials will interchange between the two different style of housing.