This might be a first.
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From: Billings Montana
This might be a first.
I have an 86 F-250HD 4x4 with a 460 and t-19. My engine is dying a slow and painful death, it's drinking 2 quarts of oil a week and it's guzzling gas,(it's a 460 after all). Years ago I had an 83 F-150 with a 300 I-6 that was great. Good mileage and rock steady reliability.
I'm thinking about yanking the 460 and putting in a 300 I-6. The benefits are that it would really open up the engine bay, shed weight off the front, and I could get good mileage again. I don't tow anything with this truck except for a trip to the dump or something like that. In short, I don't want a truck that I can't afford to drive, and I don't need to go fast in it. I'd like your opinions on what it would take to make this swap easier and possible. I live in Montana where there are no emissions tests so hooking up the emission crap is out, and my truck is non-catalyst anyway. I also would swap the t-19 for an NP435 trans and I'm considering swapping from 4.10's to 3.55 gear with the swap.
Besides the motor mounts, what else needs to be changed?
I'm thinking about yanking the 460 and putting in a 300 I-6. The benefits are that it would really open up the engine bay, shed weight off the front, and I could get good mileage again. I don't tow anything with this truck except for a trip to the dump or something like that. In short, I don't want a truck that I can't afford to drive, and I don't need to go fast in it. I'd like your opinions on what it would take to make this swap easier and possible. I live in Montana where there are no emissions tests so hooking up the emission crap is out, and my truck is non-catalyst anyway. I also would swap the t-19 for an NP435 trans and I'm considering swapping from 4.10's to 3.55 gear with the swap.
Besides the motor mounts, what else needs to be changed?
Post Fiend
Joined: Jan 2000
Posts: 5,330
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From: Dryden, ON, Canada
You may encounter a long hard search trying to find a drivers side motor mount perch for the 300, the 460 and diesel trucks use a different engine crossmember, and it is shaped differently where that perch sits.
3 of the boltholes look like they'll line up, but the 4th doesn't even catch anything you could drill a hole in...
As for the transmission, unless the T19 is going out, just swap bellhousings. You're gonna have to deal with the clutch too, the big block slave cyl won't work on a small block without some creative engineering.
3 of the boltholes look like they'll line up, but the 4th doesn't even catch anything you could drill a hole in...
As for the transmission, unless the T19 is going out, just swap bellhousings. You're gonna have to deal with the clutch too, the big block slave cyl won't work on a small block without some creative engineering.
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From: Billings Montana
O.K. I have been talking it over with a friend of mine and he and I have come to the conclusion that I should probably find a 460 from a mid-70's Lincoln and build up a bad *ss big block. But my other question is, will the NP435 fit with little problem? My T-19 has a bad synchro in 3rd gear, (I know this makes this truck sound like crap, but it isn't, really). I like the lower first gear ratio of the NP435 and the true "truck" feel of the tranny.
So, if I ditch the idea of the 300 I-6, and go with the idea of an NP435, can the tranny swap be made to work?
BTW, I know about the clutch set-up being different, but will I need any special order parts?
So, if I ditch the idea of the 300 I-6, and go with the idea of an NP435, can the tranny swap be made to work?
BTW, I know about the clutch set-up being different, but will I need any special order parts?
Post Fiend
Joined: Nov 2001
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From: Coutts Canada
Yeah the tranny swap will work (the t-18, t-19 and NP435 all interchange between ford as long as you have the right accessories), As far as your motor problems, i would just do a mild rebuild on your 460 but go with some flat top pistons, an RV cam, carter carb, a high volume oil pump, then all ne bearnings, seals, rings, etc. If you do it yourself you can save a lot of money, and if you have the funds to permit get a set of headers and dual exhaust. Also the thing that is killing your milage are those 4.10 gears, with a mildly rebuilt 460, those 3.54s will be very nice but your millage still isn't going to the greatest.
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From: Billings Montana
Yeah, I agree with you there. My buddy and I agree'd that it would make sense to rebuild the 460, with a little extra oomph. 
As far as the tranny goes, did Ford put the NP435 in F-250's or did they only put them in F-150's? If I was to look for a truck to pull one out of, what year and model should I look into?
As far as the tranny goes, did Ford put the NP435 in F-250's or did they only put them in F-150's? If I was to look for a truck to pull one out of, what year and model should I look into?
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Post Fiend
Joined: Jan 2000
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From: Dryden, ON, Canada
The 435 and T18 came behind everything but 460's and diesels(the 460 wasn't avalable with a stick prior to 83, and when it was re-introduced in 83 beside the 6.9, the only 4 speed put behind either was the T19.)
If you find a T18, low gear isn't quite as low as a 435(may be the same as your 19, depending on which gearset it has) but, it is the same case legnth as the T19, while the NP435 is 2" shorter.
If you find a T18, low gear isn't quite as low as a 435(may be the same as your 19, depending on which gearset it has) but, it is the same case legnth as the T19, while the NP435 is 2" shorter.
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Posting Guru
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From: Billings Montana
Thanks
Thanks for the input guys. I have also been thinking of the T-19 because it's already there and set up for it. I just liked the NP435's granny low ratio. I think I'm going to go with what Ford put in there, with a few mods to make them better, and call it good to go.
Post Fiend
Joined: Jan 2000
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From: Dryden, ON, Canada
There are three gearsets in the T19, one with a 4.02:1 first gear(most common behind diesels) one with a 5.11 first(most common of the lot) and one with a 6.32:1 first gear(same as a T18, and is mostly found behind 460's, I have one) A NP435 is 6.69:1, with the amount of torque a 460 makes, that .37 difference isn't going to be all that noticeable.
You are most likley going to find locating another T19 a task and a half however...
You are most likley going to find locating another T19 a task and a half however...
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From: Billings Montana
I came to the conclusion that I'm going to find a 460 block, rebuild it, and get this tranny rebuilt when I'm doing the swap. I figured that if this combo was good enough from the factory, and good enough when I bought it, why am I trying to make my life harder by swapping things that weren't offered in this truck? This truck isn't a hardcore off-roader, and it won't be doing any landspeed records and if I need to tow something, I'll need the power anyway. Thanks for the input guys!
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From: GANS
Originally Posted by big hoss 29
I came to the conclusion that I'm going to find a 460 block, rebuild it, and get this tranny rebuilt when I'm doing the swap. I figured that if this combo was good enough from the factory, and good enough when I bought it, why am I trying to make my life harder by swapping things that weren't offered in this truck? This truck isn't a hardcore off-roader, and it won't be doing any landspeed records and if I need to tow something, I'll need the power anyway. Thanks for the input guys!
As you said, I'd rebuilt the 460 and T19, and you'll be in good shape...
as for the the 300 into the BB, what 82F100SWB said is correct. I was considering the same swap (long story). The one hole is missing for the motor pad, I think you could drill and space it out with grade 8 washers. You could run your truck with the 300 until you get the 460 rebuilt.