I currenty have a 4/7 drop on a 2009 crew cab 4x4 with no problems. My biggest recommendation would be helper bags. Also will depend on your wheel offset what kind of rubbing you will expierence if any.
They are made to help level and keep the truck from bottoming out with a load. They install between the frame and leafs. For instance I would keep about 8 lbs psi in them at all times and would never bottom out. Also they allow you to adjust height of the truck slightly. With your typical 4/7 drop the rear will sit lower than the front. Put a few pounds in the bags and now you sit level. They are like 300 to 350 dollars for the kit But unless you want to do a c-notch it is the best option.
update went to shop today to get drop kit done i can not do 4/6 its to low for the wheels i have i will not be able to tuck they will rub so the man says.....so im goin with a 3/5 and still gonna do the helper bags is there anything different in the kit or that i will need compared to the 4/6
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