A crane mounting system to be used for mounting a crane onto a truck frame utilizes at least two shear plates with an L-shape profile. One part of each shear plate is interposed between a respective frame rail of the truck chassis and a respective end of a transverse mounting bar, while the orthogonal part of each shear plate is welded, at least partially, to the outer side of the respective frame rail. Interior holes on the transverse bars are threaded to accept inner tie down bolts while outer holes are drilled through to accept tie down studs. The shear plate acts as a wear plate/surface as the crane base sits on the transverse bars that in turn nests on the bent plate rather than directly on the chassis frame rail.