Your drag advice needed

Center of housing perches? I believe its 43". I moved springs to under the frame rails. I can dbl ck tomorrow. 3.5" cut off stock a body dana housing. Strange axles and same 4.5 back space as stock. Best thing to do is set the tire where you want it and take measurements from there. Thats how I fit them cause it has to be exact to fit those big boys under there but they definetly fit with no other trimming or hammering. If you are gonna lower it alot then you may have to modify the outer wheel housing up inside cuz they curve inward. Just stuff 1 under there where you want it and go from there.