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i you want a 4x4 truck this is going to be more of a body swap than a frame swap. swap your body over to a 77 1/2 to 79 4x4 frame. that will all bolt up with no problems. now, to get a 351W into a 4x4 is different. they never offered winsors or 302 in 4x4s from 73-79. your going to need a bellhousing if the truck is a standard shift. if it is a automatic (c6) you're going to have to find another tranny out of a 80s 4x4 with a small block bellhousing. if you want to keep the c6 in it, that would have a big block bellhousing ,unless you find a rare 6 cylinder 4x4, you cant. you could use the c6 that is in you 2wd(if thats what it is) but you will have to change the tailshaft so it will bolt up to the transfer case. you use the tailshaft from the 4x4 c6. to do this you have to take everything out from the front to change them. if your tranny is a c4 this wont work and you'd be better off getting a different tranny from a 80s 4x4. you'd be better off just keeping your 2wd a 2wd and finding a ford 4x4. get rid of that chebby!