These frame boxing sets are designed to reinforce your failure prone factory frame.  This kit will work with the stock motor mounts and front cross members. The standard kit boxes the frame rails in from the steering box to the back of the cab, while extended versions will do the entire frame for the ultimate in strength.  Fabrication and welding are required!  This mount options works with all the factory mounts and cross members, perfect for Cummins swaps, LSx swaps, and heavy offroad use.  Say goodbye to frame issues and cracks, it also comes with machined DOM sleeves and grade 8 hardware for the steering box to reinforce that trouble prone area.  Made in the USA!