Happy Thanksgiving to All. With the Black Friday weekend upon us, I see Strange Axle has a Nice Deal for the Holiday shopping, 10% Off, and FREE Shipping ! I need to get my rear axle for my '63 build, so just looking for some advice on some of the options available on a new unit. The car will be street/strip driven, not looking to enter a Series event, where winning is the goal, just taking part, with no major punishment to the drivetrain regularly. Engine should be around 580 HP/Torque, + or - 40. Automatic, probably choosing 3:73 G/R, so street driving will be decent, but still have some bite on starts. I would prefer to "over build", in case the car goes to the next level at some point. Any recommendations for the Posi unit, stud size, etc, on options ? Also, does the stock spring perch location work well, when using MP SS springs, with shims as needed to correct the pinion angle ? Any input, and advice appreciated, and enjoy the Day, Thanks...