my dad has a 94 quigley van from n.c. everything in the conversion is from a f150. he has the parts list on everything to get replacement parts. they used a 79 dana 44 front axle. its kinda set up like a dodge front axle with a 4 link and same with the steering. but its all ford part numbers for brakes ball joints tie rods ect. if you want to do a 4x4 conversion i can scan the parts list and send you the info. it clears 32x11.50s with the aluminum running boards. if he takes them off it will go 33s hes wanting to go up to 35s. its fun to take out and it gets alot of looks!
a side note.... ive seen handicap e series vans with 3 inch body lifts to help clear with the side door ramps. might be a easy way to get a bigger tire also and might be a cheap way.