no bow for me. salmon38 said it first. (i did give credit in my post earlier)

but the online manual says the safe-t-track is interchangeable with the standard. so the break points should be the same.

the corporate rear and the BOP have different break points. so as far as i can tell, you can use the same ring and pinion on a posi, as long as it is the same seies, and you're not trying to bolt a BOP bolt pattern ring on a GM corporate unit.

i think most of the chevy corporate rears (8.2, 8.5, 7.5, etc..) all have the same break points as each other... also whether or not they are posi. they are listed in the first column of the link i gave.