Quick performance 9 inch for gm a body

Rear end is new, got it with a car i bought and no longer need. Has disc brakes, the gear ratio is either 4.00 or 3.90 best I can tell. The bolt pattern is 5x4.75. The width is 56.5 from wheel face to wheel face. Not sure if it's posi or spool or axle spline count.