I have a 92 F350 w/7.5(460) like the engine dont like the milage. Was reading in some of the threads about the cummins engine swap and the site for such thing. My question is why not go with the International 7.3 that came in the Fords? How much trouble would it be to swap the 7.5 for the 7.3? Or is it easier to swap the cummins instead?

 

although ive havent done this, the cummins 6bt is NO WIRES basically much simpiler to swap there is some fabrication needed like motor mounts and such and a kind of pricey adapter plate for the trans. there is a lot of info on the web and some how to's on 4btswaps.com

to go to a powerstroke the best way to go is to get a wrecked 7.3 to swap everything over

 

Plus the kind of pricey 6BT...

BTW, a 4BT only puts out:
non intercooled, 105 hp, 300 ft/lbs of torque
intercooled, 120 hp,320 ft/lbs of torque
I agree, the wrecked 7.3 would be the better bet.

 

so the 7.3 will plug and play so to speak??

 

some 4bt's can be found in the old bread trucks. when aluminum scrap is high, you can ultimitely have the 4bt for much cheaper leaving money for injectors, turbo and all the little things change certain springs and such they do to cummins motors. i have also heard using certain year i6 4.9L ford motor mounts and certain 4bt mounts will bolt right up. the 4bt is obviously smaller than the 6bt thus will be much easier (i believe) plus you can have a peppy 4 banger stomping the v8s. i am planning to do this swap... one day

edit: but, i think this swap is better suited for a 150

 

well i actually wanted it for pulling and better mileage so is the wiring harness for the F 350 with the 7.5 the same wiring harness as the one for the 7.3? If not what mods would be needed to complete this? There is a website that makes a kit for the Cummins. Just thought someone might would know on here.

 

it may not have as much power and torque as a 7.3, but ive seen a 4bt in a lifted chevy, that got 32 mpg. 6bt's can bring some ponies and torque too and still get some mpgs. turn up the injector pump and throw in some bigger injectors and youd do better in the power department.

 

if the op ever comes back, or someone else is lookin for the same info; the 4bt can lay down 300/600 wheel hp/tq easily, its just a matter of buyin a few parts. and, depending on which pump you find (i.e. finding one with a p-pump) means your desire (and pocket depth) is the limit. of course, only about 10% of them came p-pumpd. a 4bt in these light ole trucks would net you high 20's into the mid 30's for an average mpg dependin on your setup and driving style. a 6bt would prob put you avg'ing in the low-mid 20's or even in the low 30's also dependin on your setup and drivin style.

i personally wouldnt go through the trouble swappin any other diesel beside one of these two. a 4bt in these light trucks would tow/drive empty just like a 6bt would in the newer much heavier dodges. the other early mechanical diesels are just nothin but slugs that get decent mileage and ruin front ends.

 

A plain 7.3 (i.e. non-turbo, non-PSD) only needs one 12v wire to run so it's a pretty easy hookup. The bellhousing is different from your 460, tho, so you will need a different tranny. If you go E4OD, that is where the wiring is. The 6.9Ls are super-cheap, nobody wants them, and they don't give up but about 20-30 HP to the 7.3L, if that.

I met a guy the other day who had a 4BT in a 96 Bronco with a ZF5 behind it, he said he was getting 25 in town and 28 on the highway. The 6.9/7.3 cannot match that, but the 4BTs are pretty spendy up front.