Noisy rearend 69 barracuda 318 car

No 7.25 rear end has axle retaining "C" clips. All 8.25 rear ends do. As long as replacement rear is 5 lug x 4" wheel mounting pattern and the OD of the backing plates are the same on both rear ends you should not have to change backing plates. If backing plate OD's are different (one has 9" dia brakes and the other 10" dia.) just remove the (4) axle retaining nuts using the access hole in the axle face and tug or use puller. You do not have to open the gearcase to pull a on a 7.25 rear.