rize makes good stuff, its spendy but its good stuff, I've lifted a few newer f150's with fabtechs 6 inch lift (wich will clear 37's btw) and with 35/12.50-18's it rode pretty damn good for a stock truck without driveline vibration. 8inches may be a different story though, it depends on the truck, usually shorter wheel base trucks have a problem with driveline binding or vibration because even with a small lift it puts the ujoints at a steep angle, alot of longbed trucks that you see lifted 8-10 even higher have no driveline vibration because the drivelines longer and isnt at as steep of an angle