It could be from a Camaro. The correct code for a 1967 3:55 posi rear is UW. Not PH. The mono-leaf springs were prone to wrap-up so in '68 they changer to multi-leafs. EDIT: Yup, it is a 1967 Camaro rear. See this link: Camaro drivetrain codes Now you need to find the axle brackets and get that stuff operational. Whoever did the swap was stupid by not transferring the brackets to the new rear. The brackets and bars are unbelievably rare, so having a metal shop fabricate some may be the best answer.