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Generation 4 1961-1966 F100, F250, F350

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Old 07-21-2014, 10:53 PM
junkyardjeff junkyardjeff is offline
 
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Converting a F250 into a 1/2 ton

I put a 460 in my 66 F250 and now wanting to see if I can squeeze a little more gas mileage out of the beast since gas has gotten more expensive since the project started so the cheapest way is to convert to a 1/2 ton,since I have a 78 F150 that will be donating the front suspension and have a 9 inch from a 67 to 72 f100 being removed in a local junkyard this winter I will be doing the conversion. I probably should have put a 351-W and AOD in it but could not pass up a fresh 460 and C-6 for 500 dolars so it went in,I thought I was going to do more serious hauling but I just want to be able to drive it on long trips so a 1/2 ton is what it will be when I am done and will thgrow the original suspension in the shed in case I want to put it back.
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Old 07-22-2014, 05:12 AM
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I don't see where the different suspension is going to save on gas mileage.
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Old 07-22-2014, 07:24 PM
junkyardjeff junkyardjeff is offline
 
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With a 9 inch instead of the Dana 60 I can play with gear ratios much easier,it has 3.54s now but going to try 2.75 or 3.00 which the 460 should have enough torque so it wont be bogged down too much. It also needs tires so 15 inch will be a little cheaper then the 16 inch truck tires.
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Old 07-22-2014, 08:12 PM
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If mileage is your primary concern, a truck is not the way to got go about IMO.
I realize what you are saying about swapping out the carriers on the 9''.....but it seems a great deal of work.....just swap the gears out on the 60.
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Old 07-22-2014, 10:17 PM
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I wish I knew how expensive it was going to be to put a overdrive trans behind a 460 before I bought it or I would have got a 351-W instead,it got 13 on a small trip last fall and thinking with more highway gears and some tuning I might be able to get it in the 16 to 18 range and that would be good enough for me. The 3.54 gears in the Dana 60 are the best I can get and need better and it should take me a week to convert to 1/2 ton and much cheaper then to put a o/d trans behind the 460,I think there is a vibration coming from the rear end so I think something in the limited slip parts is wearing out so this winter its going to become a 1/2 ton.
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Old 07-23-2014, 01:15 PM
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Originally Posted by junkyardjeff View Post
With a 9 inch instead of the Dana 60 I can play with gear ratios much easier,it has 3.54s now but going to try 2.75 or 3.00 which the 460 should have enough torque so it wont be bogged down too much. It also needs tires so 15 inch will be a little cheaper then the 16 inch truck tires.
i wouldnt do anything under 3.25 gear for r&p if you do go to the 9"... anything below that and your engines going to have to work harder just to get you going... harder it works the more fuel your going to be burning. yeah itll lower your rpm's for street/highway going to that low of a gear.. but youll also be killing any acceleration you have as well.. and if you ever had to haul or tow something it would make it just that much harder on the rest of the drivetrain..

I would stay with the larger tires though.. the longer circumference of the 16in tire will allow you to travel further on 1 revolution than you would for the 15in. the smaller diameter tire would be counter productive to what your trying to do with the R&P change since your powertrain would then have to turn that smaller tire more revolutions to cover the same distance as the larger one did with 1.

if you really want to help with economy.. if your truck does not have an OD transmission i would suggest swapping one in that does have OD. itll help you out on the longer highway trips than anything else.
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Old 07-23-2014, 02:41 PM
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Save your money and put it toward gas. I know gas is expensive but sounds like a lot of time and money to save a few dollars. It'll take quite awhile to notice a huge difference in savings. Plus going from an f250 down to a 1/2 ton is like trading in a super model for a big girl
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Old 08-16-2014, 11:38 PM
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Picked up the 9 inch from the junkyard today,it took them a couple weeks to get it out but I was in no hurry. I have the front suspension but can not cut up the truck at this time so I will have to find another since I plan on doing the swap before it gets cold,the 9 inch has 3.70 gears which is a little more then I want so the 3.00 gears will be going it.
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Old 08-16-2014, 11:40 PM
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btw.. just to let you know... on the mustang forums guys have compaired mpg when chaning R&P gears... when they went from 3.55-4.10's all they saw for a difference of mpg was 1mpg on the highway... they said city there wasnt any difference for them
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Old 08-17-2014, 09:20 AM
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The mustangs most likely had o/d which I do not,I would leave it a 3/4 ton if I could put a o/d trans behind the 460 but its cheaper to convert to a 1/2 ton. Its going to cost a couple grand minimum to put a o/d trans behind that motor and I will have less then 500 in it doing it my way.
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