The odd-ball Dana 53 also had a 9.25" ring gear, but it was completely different than the common, Mopar 9.25" rear.

I've owned 5 73 Duster 340's since 1973. One I bought off a Mopar dealership new,2 I bought with 10,000 mile so or less. The others were from private individuals. The weird thing about it is all of them had 81/4 suregrip rearends. I've read that somewhere in early production of the 73's Mother mopar replaced the 83/4 rearends with 81/4 rearends. I also might ad that on the new one I had there was a recall on the rearends.The small bolt the holds the shaft in place. Had the tenaancy to loosen up.The shaft would slide out. Caused quite a mess if you were going driving on highway. Mine fell out in a parking lot and the rearend locked up.The dealer took it in and replaced some gears,bolt and shaft.And did something to correct the problem. does anyone have any information on this?

A-body 8 3/4" rears were discontinued after the 1972 model year. The factory never made one with 5 x 4 1/2" bolt pattern.