hey i have an 89 f250 and want to knowif i get dually rims off of a 350 will they work on to make it a dually truck.

Rear end needs to be wider.... or use spacers.

I looked into this for a 79 F250 a long time ago. All though I never followed through with it I was told it would work with the stock single wheel axle but the inside tire would be very close to the leaf spring. Maybe like an inch of clearence?

http://www.wheeladapter.com/DuallyAdapters.asp

Either spacers or drums change, there is no other way for the rims to fit.