8 3/4 suregrip

http://www.bigblockmopar.nl/tech/mopar-rearaxle-dimensions/

only goes to 66 A body
width of A body rearend...57 1/8 vs 59 1/2 for mine
flange 52 5/8 vs 54 1/4
perch 43 vs 44

mine id big bolt pattern