I recently purchased a 77 F150 SC with a 351M. Its automatic but I don't know for sure what transmission is in the truck. I'm very new to anything beyond the engine block itself. (only one tear down/build up of a 351W but no experience outside of that) I have been reading for a little over a week about 4x4 transmission/differentials/axels so please bear with any stupid questions. I know I have a lot more reading to do but I have some questions that I'm hoping people could share a bit of knowledge about so I can keep googling and reading.

Things I'm trying to understand and haven't picked up yet.

1. I have read on more than a few threads that people suggest putting the SC cab on to a 4x4 frame and making the modifications to the body. This isn't really the avenue I want to go down, but I'm wondering what exactly needs to be modified on the 77 SC frame to complete the 4x4 conversion. I think I've picked up that it has something to do with modifying a cross member but since almost everyone says to move the body to a 4x4 frame I haven't been able to find much info about what actually would have to change on a SC frame.

2. There is a 77 F250 crew cab 4x4 about an hour away. It has dana 60 front and rear but is a 4 speed manual transmission. I want to keep my 351M and auto but if I were to be able to get the F250 truck, would both axels go in to the 77 F150 SC auto? Would anything other than the frame question above also need to be modified?

3. Is there something different about a C-6 in a 4x4 vs 4x2? If so, could anyone give me some pointers on what is different?

4. I think I've picked up that lifting the truck may also help with making the conversion. I don't really understand why, would be interested in anyones input.

Thank you in advance for any pointers, suggestions, direction. I'm a long way from making any decisions but I'm very interested in making this conversion work.

Ahnjoan

 

that 4x4 crew is probably leaf front where your 2wd is coil. Can still be done, but it won't be a direct swap.

AFAIK, the 2wd auto tranny has a longer tail than the 4wd, but if you use a divorced case and reworked driveshafts, that wouldn't really be too much of an issue.

I don't see lifting it making any difference other than having more room to work,,, well, I guess if you did put an axle under the front then a good lift would help you avoid messing with the crossmember as your pumpkin wouldn't hit it.

 

Good Link

https://www.ford-trucks.com/forums/8...?highlight=4x4

 

A 4wd swap with the stock 2wd frame is cake work. Ive about done with mine. Where are you located? If you get that crew for parts i may take whats left off your hands.

 

I wanted to ask if you could get away with not sliding the 4 wheel frame section into the 2 wheel frame? Assuming you put a big enough lift on the truck so the diff doesn't hit the cross member is there anything that would not allow a person to just bolt the axle to the 2 wheel spring perches and bolt the power steering box on? I realize there is more to it but just in very basic terms.