I thought a Bronco body was closer to a supercab. Not that those are easy to come by but would it fit without modifying body mounts? Just curious. I am thinking to about a similar swap as you guys.

Alec

 

from a quick measurement it looks like the pickup cab at the rear mounts is about 4.5" above the frame rails.
I havent measured the frame width at that point to see if you can use the pickup crossmember, as I dont plan on using stock mounting on my 4x4 project.

 

I think that it would be easier to fab new mounts for the rear of the cab. M J what r u gonna do for a bed. Are you gonna use a flat bed or modify the truck bed

 

mine is more of a 4x4 buggy creation, will have bedsides about 54" long.
I use propane for fuel on it and am moving the tank above the frame rail behind the cab and chop the rear rails to reduce rear overhang to the bare minimum
none of my info from here on in is going to help someone trying to make a nice driver, just thought I could help a bit as I had the same parts going together

 

What is the advatage of using propane rather than gasoline

 

cleaner burning (it is a low carbon fuel), no fuel pump required (pressure is maintained in the tank by the boiling point of the fuel), can run upsidedown, cheaper then gasoline by about 40%
extremely simple to work on, far more simple then a gasoline carberator

 

fromm,
What are you gonna do with the bronco body?

 

I am unsure what ill do with it . Ill probably rob parts off of it

 

Oh believe me this is no "nice driver". The body on this truck has had a slow and painful death. At least painful to watch! The reason I asked about a supercab is because I might be able to get one and thought if it fit easier and had a little extra room inside then why not.

Alec

 

oh i got one word of advice, this applies to cutting down a long box bed to a short box bed, the only reason i stress this so much, is the previous owner of my truck could not find a short box bed, so he got a texas long box because there easier to find, anyways he cut the box the wrong way, and when i mean the wrong way i will explain in my pictures, i will show you the WRONG WAY then the RIGHT WAY to shorten any truck bed, and this applies to cutting down the box to go on the shorter 78-79 bronco frame,

first you start with the long box, (this image was grabbed off google i have no idea whos truck it is, but it is a nice truck!, if ya own or know the truck drop me line on here



this is the way the previous owner of my truck shortened the box he cut the shaded part which leaves a seam and he did a poor job lining up the body lines



you see it will leave a seam that you have to hide, well thats half the battle with this way of cutting the box, you also have to make darn sure you go the center dent and body lines lined up perfect!



now this is the way you shorten any truck box! when you cut the shaded area off you simply fold the panel leading edge like the factory did and weld it to the front box wall, then your done! no seam to hide! and no matching body lines!



here is what the long box looks cut down to short box length, mind you this is a quick chop in windows paint, this cut is not 100 percent correct to scale



here is a even shorter version, this is just for fun, this is what a bronco short box would be



i don't think this is a very hard project to do, i just wanted to mention this before you run into a problem, hope my advice helps, and i know this advice may seem simple, but it wasn't simple enough for the previous owner of my truck and now i got some fixing to do!
-Brent

 

is the distance from the rear of the fender to the tail lights the same on a long bed as a short bed

 

supercab will need cut for tire clearance

 

it sure is the same length, the above pictures is all you have to do to shorten a long box to a short box, it find a lot of people out there think behind the wheel is a different length? all the length is added in front of the rear wheels, i am not sure about other makes but i know this applies to 73-79 ford style side beds

well you could even cut a rare short box down to the shorter box (bronco box) but i highly recommend cutting down a common long box you will have to do some measuring since you can't go by a regular short box length, you are creating something completely custom, you will either have to find some one else who has done the same thing to a dentside 73-79 ford truck or you will have to crunch the numbers and do some measuring, and always measure 3 times then cut! you can measure a 100 times but you can't undo a cut! if ya need any more help just ask, i am sure there is other members who will chime in any time (next 1-3 days) all the best with your project and it looks like it won't be that hard, also when you cut the box it might me a smart idea to weld in a brace going from the drivers side to the passenger side, long piece of simple angle iron will work good, just to keep the box square, good luck and make sure you post pictures in this thread!
-Brent

 

1978 body layout book states
L2 = inside cargo area of box
6-3/4 box = 80.72
8 box = 96.92

L6 = cab to rear axle CL
6-3/4 box = 40
8 box = 56.20

both styles show 46.55 from rear axle CL to back of box

1977f150xlt is spot on I would say

 

thanks for posting the box lengths! and thanks for posting the distances in front of the rear axle, i did not have those numbers, thanks for showing the exact measurement behind the rear axle, i have ran into a good number of people who think you have to cut the front and back of the box to get a short box? i like to correct them, because a lot of people will either not attempt a easy box cut because they think its too much work, or they will start cutting and mess up like my trucks previous owner! any ways thanks for adding the measurements! i will write those measurements down for future use!
-Brent