I have a 03' F-150 4X4 Heritage edition with 17" rims. I was wondering if 33/12.5/17 would clear without any modifications would work.

 

Yes, they will fit easily if you use your OEM wheels. If you mount them on 17x10's, you will have to trim a little plastic off your front bumper's lower valance. With a narrower aftermarket wheel you may or may not have to trim.

 

Yeah it will work fine, if you do have to end up trimming some plastic its not alot at all, very simple.