What's the easiest and cheapest way to fit 35s on a f250?
I was told f350 springs will work, but I can't seem to find replacement coil springs for it.
The truck is just a cruiser , while I still want to maintain the old man look.

 

A body lift....

 

X2 on cheap and easy is a 3" body lift and maybe a front fender, lower front edge trim. Way more work and expensive is Auto Fab, I am am not sure about a F250.

1965-79 Ford F150 2WD Suspension

 

Reciprocating saw is cheapest and easiest, maybe not the most cosmetic.

 

not sure what year truck you have, but i have a '76 2wd F250 and my 35s fit fine in the back with no body/suspension mods at all AND they fit in the front if you do two things:
1. trim the wheelwell openings back 1" (keeping the same shape)
2. have wheels with the correct backspacing

for tires, im running 35-12.50-16.5 BFG A/Ts in front and some 35-12.50-16.5 Continental Mud Terrains out back.

when i originally got the truck it had some 16.5x8 mag wheels (General Lee/Dukes of Hazard style) on there with some bald 33-12.50-16.5s and when i put my 35s on there i had no rubbing on the frame/suspension lock to lock. The tires WERE however grabbing the rolled, inside lip of the fenders which was quickly taken care of by simply trimming the openings back about an inch following the same shape of the original openings and that was pretty much that.

now, i recently switched over to a set of stock 16.5"x7" steelies and due to the "shallower" backspacing on those wheels im now getting some slight rubbing on the radius rods at full lock - not a big deal and nothing some 1/4" wheel spacers wont take care of in a jiffy.

but to get back to your question, $10 bucks in cutting wheels for my grinder is all that was needed had i kept the mags on there, but with the steelies ill be tacking on another $25 for some 1/4" wheel spacers - so basically $40 bucks and about an hour out of your Saturday afternoon will get you to where you wanna be ; )

THAT BEING SAID!!! not sure about yours, but my truck still has its original suspension which gives it a sort of "tail-high" kind of a stance and i think i got a pretty good "low buck" solution for that issue...

1. buy a set of stock replacement springs to replace the original sagged out ones (maaaay get a slight amount of lift, but not counting on much)

2. relocate the coil buckets DOWN 2" on the frame - im basically looking to level out the truck as opposed to setting the suspension up for "Prerunning"/aggressive offroading etc.... so drilling out a new set of holes, using some THICK, high-grade nuts and bolts and maybe a couple of welded gussets tying (tieing?) the frame to the coil buckets and that should be that ; )

and FYI - in case youre thinking about going the coil spring spacer route... i put on some 1" SPC coil spring spacers last weekend and took them right off - just too unsafe looking for me... the cast aluminum spacers filled up the entire spring pocket and the so-called pocket that the spacers have cast into them to retain the coils is just a slight "ridge" which i dont trust AT ALL (maybe someone that has spacers can chime in here???) - basically with the top of the spring completely outside of/below the stock coil bucket, i just dont trust the 1/8" ridge thats cast into those spacers to retain the springs if i hit a big pothole or steep driveway at the wrong angle or something - maybe its totally fine and im being a wuss, but that just looked way too iffy even for a cheapskate like me.

anywho, thats my $.02 - hope some of this is helpful - if youre interested, PM me and ill shoot you some before/after pics of what i did or the backspacing measurements on my mag wheels if thats something you might wanna look into --- good luck man!!!!