Jonathan is right - the 4wd F250's front end is a mix of F150 and F350. It has the TTB of the 150 and the leaf springs of the 350. And, in my opinion, is the least desirable of front suspensions in these trucks as it has a poor ride and little articulation. There are fixes for the problem, but they are expensive. DAHIK.
If you want to convert an F150 2wd to 4wd you need to find another F150 or a Bronco. Their suspensions are basically bolt-in for yours. Installing the F250's front suspension and driveline would be difficult and I don't think you'd like the results.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI