That Ford rear is an 8.8 rear with 4.25 bolt circle. The cobra hubs will bolt on and give you the 4.5 you want. Not all tbirds had the 8.8, but had the 4.25 bolt pattern. The standard v6 had a 7.5. The SC v6 birds had the 8.8 traclok rear. Not all v8 birds had the 8.8 and if they did, may not have had traclok. If you go to www.sccoa.com you will get all the answers you need, including dementions.