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79 F-150 build

264K views 1K replies 154 participants last post by  RYAN283  
#1 · (Edited)
I am building a 79 f-150 with parts that I have already laying around. Plans include Shortened wheelbase to 124", flatbed, 466 BBF, 42'' iroks, C6 and 203, 12K lb winch, welded 10.25 rear, 60 front, shackle flipped rear, 6'' skyjacker leaves in front, ditching tractor pulls and going with fenderwell exits and flowmasters... I purchased the 79 with the intentions of pulling the C6 out of it to use in a shortbox mudracer (I bought the 79 for 400 bucks with a built C6). Note I did not paint this pickup:p the guy I bought it from evidently did not prep very well, he actually raced it a few times with the stock 400. I then decided I would just ditch the bed, trim the fenders, drop in my BBF, bolt on some 38.5 boggers, gut interior, install a racing seat, 5pnt harness and quicksilver shifter. I kind of thew it together in short order and now it has been sitting in my little shop for 2 years. The 60 front is coming out from my 70 f-250 that I had the 42'' iroks on. I need to get the 86 F-250 that has the 10.25 rear that I will be using when the snow melts some (it is still at the original owners place). So far all I have really accomplished is grind the rivets off and move the axle forward where it will sit. One thing I am kind of hung up on deciding is what rear leaves to use. I am not sure whether to use the rear 70 f-250 springs or the 86 f-250 springs. Here are a few pics.
The 79 as it sits now
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The old 70 frame and running gear
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Interior
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42's and my ford cherry picker
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#4 ·
I am currently in the process of partitioning off my shop and spray insulating it so I am working in my little block building shop. I need to move my air compressor in the little shop so I can use my air tools (AIR HAMMER!). Spring bolts and bushings are going to be fun to get out of the perches. Here is a pic showing how far I am moving the axle forward.
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#16 ·
Well I got a parts pickup for this project. The original parts pickup with 10.25 is still covered in snow at the dude's house and I am impatient so... This was my dads pickup that I bought from him. It is a 1989 F-350,body is trashed, 7.3 banks turbo,ZF 5-speed, 60 front, 10.25 rear. I am going to use the 10.25 rear for the 79. Rebuild the 7.3 and install it in the 4 door 86 that is in this picture. I will also install the 5 speed that is behind it. Not sure what I will do with the 60 front yet, maybe sell it. More pics when I make some progress and have the time.

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#18 ·
I got the rear axle out of the donor pickup as well as the springs and front hangers. Here is a picture of my springs and shackle flip. How does the angle look? I will be installing a dovetailed flatbed (stealing your idea "notgonnamakeit":homer:), fuel cell and maybe a toolbox. My main concern is the springs might invert when I jump/flex it out too much. I will probably end up building/buying beefier shackles. What do you guys think?

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#20 ·
I'm new and learning, but I'll try to help. Is the truck sitting on the leaf springs in the photo? its hard to tell. The shackle angle looks a little steep, but it all depends on how much weight it will have on it when done.

Please dont stop the thread, I also have a 78 f150 and am looking forward to watching this build.
 
#21 ·
You might want to drop the front of the leaf spring hanger a few inches down to level out the spring a lil bit more. When I had my truck shackle flipped it would invert itself and i'd have to get a pry bar out to get it back in place. When I dropped the front of my leaf spring it seemed to cure that problem.

You might not want to drill any more holes till you get weight on it to see what your shackle angle will be with "running" weight on it.

Other than that, looking good!
 
#22 · (Edited)
There is no weight on the spings at all. The picture kind of makes it look like there is weight on the springs but there isn't. Still think I should move it? I am thinking once all the weight is on it should be about right. I will post another pic when I get the axle under it and frame/truck weight on it....
 
#24 · (Edited)
Thanks for the input Grant. The pic is at a goofy angle, I will look tomorrow to see how far off level the spring eyes are. Will it really matter if they aren't level other than the fact that the pinion/driveshaft angles may be off some? Only thing I am really concerned with is the possibility of inverting the shackle.
 
#25 ·
My '67 was at more of an angle than that, and it increased my pinion angle enough to where I snapped U-joints on demand. Once I lowered it, my u-joint snapping went away.

We'll see what some of the more experienced guys have to say about this matter. I know I got ALOT smoother ride after I leveled mine out as well.

My springs setup very simliar to that I could invert by bouncing on my rear bumper and lock up the rear springs.
 
#29 ·
I took a 4 ft level and rested it on the front spring eye bolt. I would say the rear of the spring hangs maybe 2 inches below level from the front...I think I am going to run it like this and if I need to change it I will. I need to get it rolling so that I can get it to the other shop where the welder is.
 
#31 ·
Once there is weight on the ass end of the truck and it's strapped to the axle it should settle 2" and be just about perfect. I'd run it, even 3/4-1 off is workable...

Keep up the good work :beer: