1986 F250 300 i6 efi conversion, SAS and more

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86f250straight6
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1986 F250 300 i6 efi conversion, SAS and more

Post #1 by 86f250straight6 » Tue Jul 18, 2017 2:29 pm

I finally got around to signing up with photobucket so I can post some pics here of my 86.

I bought this truck for $300 mostly for the body/frame and the transmission. It had an efi 302/AOD with multiple broken piston rings. Did some searching and found a 1991 f150 with a good running 300 i6, so I bought the motor, wire harness, motor mount brackets and ecm for $400.

I printed out the wiring diagrams and cut open the 91 harness and eliminted all the truck side stuff and emissions wiring so I had only what was needed to power the ecm and necessary sensors. I decided to keep the AOD since it required no wiring and I had a manual transmission ecm for the 300 so it worked together perfectly.

After I had it running I decided the stock ttb suspension was garbage and went looking for a set of 99-04 super duty axles to swap in. The main reasons for this were to have a solid front axle with modern sealed bearing hubs and rear disc brakes. I found a set in a 2001 f350 srw for $600 with a dana 60 front and full floating sterling 10.25 rear with 4.11 gears.

The rear axle was a direct bolt in swap, the only difficulty was having to swap yokes and find the correct conversion u joints to get the 86 driveshaft to work. The front axle was a little bit more of a job, you could almost squeeze it in there on a stock truck, but the spring perches are about 1/2 inch wider on the superduty axle so you have to stretch the springs a bit to line it up. I decided to build my own version of the skyy manufacturing rear shackle conversion kit instead, and built my new spring hangers to accomodate the difference in width. The whole job took a 3 day weekend to complete from measuring and designing to welding it all up and installing. Considering the time spent fabricating I could have just ordered their kit, but I believe mine is built alot heavier than their design so it was worth it i guess.
The truck has ran as my main work truck only semi-complete for the last 2 years issue free, now im taking it off the road again to do some more renovations. Here are some pics of the build (not in any particular order)
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I'm trying to build a truck that I can't break :bang:

86f250straight6
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Posts: 34
Joined: Tue Jan 17, 2017 12:01 am

Re: 1986 F250 300 i6 efi conversion, SAS and more

Post #2 by 86f250straight6 » Tue Jul 18, 2017 2:57 pm

more pics...
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The 300 i6 installed and running good

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Dual electric fan conversion

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01 Super duty donor axles with 4.10 gears

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Solid axle swap after a few thousand miles on it, zero alignment or ride quality issues so far :thumbup:

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general pic of the heap before takin it off the road

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Out at work on a welding job... So far its held up well to the abuse lol

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Kinda recent pic with the old bed removed. I got rid of that rust pile to do some frame repairs and build a flatbed for all my welding gear
I'm trying to build a truck that I can't break :bang:

Wesman07
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Re: 1986 F250 300 i6 efi conversion, SAS and more

Post #3 by Wesman07 » Fri Dec 01, 2017 5:00 pm

Very cool.... I did almost the same thing lol
86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

86f250straight6
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Re: 1986 F250 300 i6 efi conversion, SAS and more

Post #4 by 86f250straight6 » Mon Jan 15, 2018 10:12 pm

I still havent sent up notifications so i have no idea when someone replies but to check on the post. Do you have any pics of your truck? what year axle did you use? Ive always been a truck guy this is my 7th bullnose ford ive had but the first with a 6.
I'm trying to build a truck that I can't break :bang:

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bubba22349
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Location: Flagstaff, Az. 86005 near the old Route 66

Re: 1986 F250 300 i6 efi conversion, SAS and more

Post #5 by bubba22349 » Thu Jan 18, 2018 10:38 pm

:beer: congrats that looks like a real heavy duty rig! :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Wesman07
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Re: 1986 F250 300 i6 efi conversion, SAS and more

Post #6 by Wesman07 » Sat Feb 10, 2018 10:23 pm

I do, but I’m not sure if I can post them. I used an 86 kingpin axle/ 10.25.
86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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