She's got factory 4:11's rear locker, with a 4180E, Should work very well for my application, first truck I ever wheeled was a 50 flathead 3 on the floor ford, then a 56 chevy 6, 3 on the tree. Had a 56 2 ton with the 6 cylinder 4 speed x 2 speed axle, got good mileage and plenty of power. But...