They are not 5600 they are eaton 6 speeds out of something semi big. It is not going to be a dump bus but it sure will be a dumper! I am gonna look around a tad more see if I can find a overdrive 6 speed that would be sweet. I really don't wanna use my gear vendor again since now that is just going to be a weak link and a hassel in the future. Then after this project will be looking for a f550 with a blown motor and put my truck drivetrain in that and buy a 10 ton goose trailer for that setup. Now that will be the bees knees!