My new project 1968 Dart

roy villarreal said

It came with a suregrip 8.75 not sure what ratio it has yet. Need to pull third member to see.

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No you don't. Just turn the driveshaft one revolution (If posi)and count how many turns driveshaft turns (3 1/2 turns = 355 gear. ) Open rear end just jack 1 tire off the ground and do 2 turns off the tire and count revolutions on DS.