Looking to lift my 03 supercrew fx4 with 6 inch lift and 37s .im wanting to keep the factory fx4 wheels what is needed to achieve this, ive read where factory wheels wont work but ive seen 37s on fx4 wheels... wheelspacer?

 

Most full 6 inch lift will require wheel spacers to keep OEM wheels. Just make sure you buy a quality hub centric design. And, you may still need to add a body lift to fit 37's. Since you want to keep the OEM wheels, I assume you want a 12.50 inch wide tire, so you may be alright without the body lift.