jdm customs
+1y
5 3/4 is what you need. i would stock floor it then traditional the rest of the way. not the other way around. its just easier. if you notch into the frame 1/2 way to fit a 7 inch slam up front it will get you enough lift for 18's. you will have to make new uppers like we did on josh's truck. isuzu cabs are really tall. i dont think i've seen one doored yet. DO IT!!! You can go to jdmcustoms.net to see some of the progress on josh's truck. projects then isuzu. l8r