ok so i have a 07 420 rancher EFI i had 30" silverbacks on it eventually my transmission gave out but over all was happy with how it rode. so now i got it apart fixing the trans and i want to turn 33" tractor tires... which even though larger in size weigh less. so far i am doing a 53% gear reduction, as well as planning to have a 500 cylinder/head put back on it instead of the 420. i have a programmer/exhaust to richen the AFR was wondering if there are any other popular mods? cams? idk as well as will any 07-13 cylinder work? that is how im understanding it.