A lifting mechanism for a toolbox contained in a truck box is provided. The lifting mechanism may include an outer truck box having a cover, an inner toolbox, and a tray that supports the inner box. A connecting link is coupled to the cover and to the tray for guiding the inner box between an elevated position and a lowered position. A lift assist, such as a gas spring, is coupled to the cover for lifting the inner box when the cover is opened and lowering the inner box when the cover is closed. In another embodiment, the lifting mechanism may comprise an L-shaped slotted link mounted to the cover and to the tray for guiding the inner box between the elevated position and the lowered position.