I am looking to swap a ford 9" into my 65 mustang. Ideally I would like a POSI. It seems to me that the ford 8.8 rear is cheaper, lighter, more likely to have a traction-lock center, and offers more disc brake options. Is the major problem with these rears the pinion offset? If I have to relocate the perches and narrow the housing, it seems like this shouldn't be that big of an issue. Can these axles be shortened? In know 31 spline axles can be resplined, but am unsure of 8.8's. Is it cheaper to shorten a 31 spine 9" axle or order a new axle?