Hi i just bought this mustang off my dad it was a v6 but he put 5.0 in it but he did not change the rearend he wants to sell me an 8.8 for it but it is 4 lug out of a 91 can i keep it 4 lug and make the front 4 lug or do i need to get a kit to change the rear to 5 lug and if i need to get kit what do i look for thanks