Dart Rearend

I could be wrong but I think it is like this - up to and including 72 is all small bolt pattern, 72 was the last year for 8 3/4 in A body (perhaps 73?). 72 and down 4 piston discs are small bolt pattern, all 73 and up discs (single piston) are large bolt pattern, and 73 and up drum brake cars are small bolt pattern

Definitely all 8 3/4 A body rears are small bolt pattern