F150 Dually?
Senior User
Joined: May 2007
Posts: 191
Likes: 0
From: Arkoma,Oklahoma
web site i found gives the same oem number for stock 4x4f150 rear springs and stock f350 rear springs
also same dimensions
http://www.101part.net/scart/product...Num=JRS-43-803
also same dimensions
http://www.101part.net/scart/product...Num=JRS-43-803
Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
The rear springs will not fit. 2wd f150 uses 2.5 " springs. Unless the f350 is a CNC , F350 uses use 3" springs. If it is a CNC the spring perch width is wrong but it uses 2.5" springs.
And i dont know for sure but i would be the farm that the u-joint from a f150 will not fit an f350 yolk, but you could get a conversion joint i'm sure.
And where are you going to find 8 lug hubs to go on a f150 spindle? not going to happen. The spindle was designed to carry so much weight and it is relavent to the amount of lugs on the hub.
GO BUY A DUALLY
And i dont know for sure but i would be the farm that the u-joint from a f150 will not fit an f350 yolk, but you could get a conversion joint i'm sure.
And where are you going to find 8 lug hubs to go on a f150 spindle? not going to happen. The spindle was designed to carry so much weight and it is relavent to the amount of lugs on the hub.
GO BUY A DUALLY
Fleet Mechanic
Joined: May 2009
Posts: 1,460
Likes: 6
From: Bay Area, Unfortunately
Long and short - It can technically be done, BUT I would be pissed off if, God forbid, someone hit my wife or kids because they had overloaded a truck never designed for that load and the chassis/braking system was not up to par. There would be no stopping me. Yes, it is seen all the time these trucks dangerously overloaded and they get away with it, but for how long? I do what I can to address the issue, but too many of these things are being loaded in a manner they were never meant to be and you get a bad result.
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Senior User
Joined: Dec 2006
Posts: 250
Likes: 0
From: South Western Ontario
Whenever I see an old or new overloaded f150 going down the street they are usually going very slow, however, I have never seen a f350 overloaded in my life. I dont even beleive we were talking about overloading trucks, that would make a great thread. I guess the only way to turn a f150 into a f350 is to use the body and change eveything underneath it.
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Senior User
Joined: Dec 2006
Posts: 250
Likes: 0
From: South Western Ontario
Can I pop the rivets at the wreckers off the 350 and throw the leafs on my truck with new U Bolts and 350 hangers. Same axle thats on my truck will be used. What do you think All Star?
Senior User
Joined: May 2007
Posts: 274
Likes: 0
Just to go off at a slight tangent, but have you ever thought of adding airbags to the back? It technically won't add carrying capacity but it will allow you to carry up to capacity without the **** dragging on the ground. I've got them on mine and they are extremely good and very easy to install.
Edit: One huge advantage is that when you are unloaded you let the airbags down. You can't 'let down' a set of 350 springs so that it is semi-comfortable to ride in when unloaded
Edit: One huge advantage is that when you are unloaded you let the airbags down. You can't 'let down' a set of 350 springs so that it is semi-comfortable to ride in when unloaded
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Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
Getting the rivets out is quite a chore, not as simple as cutting them off, they are expanded in the brackets too.One thing you aren't thinking about is that the frame may not respond well to the additional weight. They aren't rated for the heavier loads the same way. May I ask what you intention for the higher rating is? Why is it you feel you need a dual rear axle? Believe it or not, it is possible that the rear u-joint is the same, but you have to check to be sure. I looked them up to compare, and the listing is the same for 1/2t and 1t, but the 1t also has a listing for the other smaller u-joint, and wasn't specific. Otherwise you would have to do some driveshaft work as well. The proportioning valve is set according to the original brake setup, so it would be a good idea to also get that if you change everything out.
And I have seen 350's overloaded, quite often...
And I have seen 350's overloaded, quite often...
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
This isn't about politics, this is about safety and common sense. The brakes, frame, suspension, axles, and tires are all designed to support a max weight. If you are exceeding that max weight to the point that you need to consider making a 1/2 ton truck into a dually, then you are overloading every other system on the truck, making it a rolling safety hazard for the driver and everyone around him on the roads.
Putting dually wheels on a 1/2 ton truck does not make it a 1 ton truck.
Please use some common sense, people.
Putting dually wheels on a 1/2 ton truck does not make it a 1 ton truck.
Please use some common sense, people.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
The 1980 also uses the Swiss cheese frame.
Also, is the Dually F-350 a chassis cab, or is it a pickup? The frame width is different between the two.
Nothing on the truck is meant to haul anything over what it's rated on the safety certification lable. Even if you did change the rear leaf's and axle to a dually, you still wont be able to haul more than the safety certification lable states, by law. Unless of course you take it to an inspector and have it reclassified. The complications, fees etc, varies state by state.
Then of course your license fee will go up.
Then you got the brake system to upgrade... etc...
Be better, safer, less legal red tape, and cheaper on your pocket to buy yourself a factory made F-350 dually.
Without doing everything by the legal book, or if you did the conversion under the table etc, if you ever got into an accident, you would be financially liable for it. Your insurance would not pay a dime. Even if the accident was not your fault.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
I guess the only way to turn a f150 into a f350 is to use the body and change eveything underneath it.
Putting the F-350 body on a F-150 doesn't change the F-150 either. It still remains the F-150.
Putting the dually axles on the F-150 is the same way. It still remains the same vehicle, because of the VIN on the frame. A F-150. It can't haul any more than what it was designed for when it came out of the factory, no matter what you do, unless you go through the red tape of getting it re-classified through your state.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
On a side note, yesterday I seen one of those Toyota pickup(mid/late 80's) that had the dually full floter axel under it. It was a conversion truck.
In the past there were companys that did those conversions, but the $$$ was a factor and most went out of bussiness, as it was cheeper to buy a already factory made vehicle.
Anyway its best not to over load a truck frame by trying to upgradeing axles/springs, but you can still do it as long as you keep your GVW in mind! I know a few people that have put a dana 60 under a F150 as they got tired of snapping axles due to a 500+hp engine and 38" tires! In the near future I'll be stuffing a Dana 70HD under a F150, but it will be off road only truck.
In the past there were companys that did those conversions, but the $$$ was a factor and most went out of bussiness, as it was cheeper to buy a already factory made vehicle.
Anyway its best not to over load a truck frame by trying to upgradeing axles/springs, but you can still do it as long as you keep your GVW in mind! I know a few people that have put a dana 60 under a F150 as they got tired of snapping axles due to a 500+hp engine and 38" tires! In the near future I'll be stuffing a Dana 70HD under a F150, but it will be off road only truck.
