[mr48chev]

A couple of photos of the rear axle you have now will help one or more of us Id the axle for you and probably turn the narrowed axle and big tires into instant trading material. For every one of us who doesn't much care for the super wide tires there is someone wetting on his shoes every time he sees a narrowed axle with big meats on the ends of it. Unless those wide tires are dying of old age and the rims are so ugly no one would want them the axle and rims and tires should be worth enough to go a long way towards putting the right axle under the truck for the wheels you want. If it has a nine inch Ford rear under it you might consider getting a correct width housing built and a pair of new axles and using the center and brakes and then selling off the narrowed housing and axles.

Delmo's not only sells rims but they build trucks they put them on so the best thing I can think of is contacting them and telling them what you have and what rims you are planning on and asking for their suggestion as to axle width and possible what model of donor axle would work without.