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rake usually refers to the rear of the vehicle being higher then the front, kinda like a hot rod.
My Step dads 73 mach 1 for example

4X4's usually want to obe level front to back, if you did a tb crank with out doing any thing to the rear you ( assuming the truck sat level to begin with) then it would have more of a prerunner look like this

so if you crank them to much you will lift the front of the truck too much...