if the van you have has the gm cummins adaptor it will not bolt up to your np435 ford bellhousing but you could just take it apart, gm cummins adaptor, flywheel and so on and ether sell it and buy what you need or just trade im sure someone on here will trade your gm stuff for there ford stuff try looking in the classified section. steveI want to put a 4bt into an f100 and I have got a motor in a bredvan. Its got a dually 14 bolt so its probly got a gm trans. I have a ford np435 and 205 t case. WIll this bolt up or do I need a gm trans?