I think I bought a '79 D100 360 p/u. The tires, 31x10 r50 15 lt, I think, are shot. New ones $150 per. I need used ones but don't know sizes. Any help? donw

 

2 or 4wd?? guessing 4wd right now on my 77 2wd i've got 296 65 15s on the rear and 215 65 15s on the front..4wd you could put 31s back on or 235 75 , it really comes down to if you want a tall or short or what kind of tire do you want a good mud tire an all terrain tire a street tire??