Cummins swaps tips or advice
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New User
Joined: Nov 2011
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Cummins swaps tips or advice
New to the forum, have researched my project for a year now but finally think I have the parts collected to do the swap, looking for any tips or recommendations on project 12v 77 highboy Thanks
5th Wheeling
Joined: Dec 2006
Posts: 35
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Good luck with your swap. I have a 77.5 F250 4X4 that I did the cummins swap last year. I had a 460 and loved it but couldn't take the 5-6 mpg while pulling my 5th wheel and boat. I now get 12-13 mpg from the Cummins. I haven't regretted it for a minute. FordCummins is a good sight for information on this swap.
Elder User
Joined: Feb 2008
Posts: 550
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From: N. IL
For the money you can make better mounts yourself. There are several options for radiators. If you set the motor back far enough you can use the stock Ford with a few modifications to the rad itself. I've seen some where guys use 1st gen dodge radiators with some slight modification to the core support.
5th Wheeling
Joined: Dec 2006
Posts: 35
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I used the radiator from my 460 and have had no problems. My radiator, and condensor bolt in the stock position. The intercooler is from the 93 Cummins I used. The only issue is the stock grille inserts have to be trimmed to compensate for the depth of the intercooler. The only other trimming was on the front crossmember.
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New User
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What transmission did you use? I was planning on the nv4500. Did you build your own motor mounts?
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Posting Guru
Joined: Oct 2007
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oh i wish i had the time!! freind of mine blew up the 5sp trany on his 05 dodge 1ton service truck and for $1700.00 for a used one he decided to sell the truck for parts i have access to the 05 mech 12v cummins for free and would love to put that into my f350 s/c and only need to re-ring/re-bearing it for $1300.00 that ford cummings site is great it seems they have done the r&d and would do this swap in a minit if it wasnt for the crossmember issue
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
Again - check the motor swap forum here.
Here's just the tip of the iceberg of what is down there.
Hope you have some time to kill
https://www.ford-trucks.com/forums/7...-crew-cab.html
https://www.ford-trucks.com/forums/1...ount-pics.html
https://www.ford-trucks.com/forums/1...mins-swap.html
https://www.ford-trucks.com/forums/1...mins-swap.html
And that's just in the 1st 5 or so posts down there
Elder User
Joined: Feb 2008
Posts: 550
Likes: 0
From: N. IL
I made my own mounts, and used the nv4500 that came in my donor truck. I used the stock trans crossmember and modified it just slightly to make it work with the nv4500.
Thanks to Chase and a few others I took some of their ideas and tweaked them to make my motor mounts.
Take the time and read through a ton of swap threads and when you tired of that read a few more. You will learn a ton of things that you had no idea could be an issue. What's better is you probably know of three different ways to solve the issue.
Also, on a different forum a member just posted about some issues of poor fitting parts and bad customer service from ford cummins.
New User
Joined: May 2010
Posts: 10
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Cummins swap
I want to put a Cummins 12 v into a 1987 F 250 to replace the 6.9 diesel, and I want to have it done. Are there any shops here in Southern Calif where I can get this all done? I do not want to attempt it on my own.
Lead Driver
Joined: Mar 2010
Posts: 5,250
Likes: 11
From: West Virginia
you bumped a 2 month old thread to ask about an 80's truck in the 70's forum? Use this thing called google and find yourself some shops, then email or pick up the phone and call them to see if they can do it. If you are close to destroked or fordcummins they could do it. I'm sure whatever shop does it will charge several thousand dollars, and, quite frankly, the 80's trucks are worth less than that even in fantastic shape, because they are ugly pieces of crap. lol
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
Call Autofab in Santee.
This guy did after talking to me & he was happy. They put a 4bt in his truck. Here's a thread.
http://www.cumminsforum.com/forum/cu...mins-swap.html
Also - here's a thread of a build up of an '86
http://www.cumminsforum.com/forum/cu...onversion.html
Lead Driver
Joined: Mar 2010
Posts: 5,250
Likes: 11
From: West Virginia
IMO, cummins really messed up by never successfully marketing the 4bt for the light duty truck market. Think of how many F150's or dodge 1500's would have been sold over the years if they had the 4 bt in them. Its a great motor and if you don't want to do any super heavy hauling (I think most lower end 4bt builds end up around like what 400 ft lbs? ) it gets good gas mileage and makes nice rattly diesel sounds. Short power band but so are most other diesels of the era. And 4bt fits in things a little better. 6bt is a big bitch.