I preface this post by saying that I am somewhat new to the tractor world. I realize that Int'l had a heel engaged lever that locked in the differential on some models, that worked only when you keep it pressed down. I know that other newer tractors had such a locking differential that would stay engaged once it was pressed. Has anyone ever heard of holding the split-brake for the wheel that is spinning to get traction for the other wheel and releasing the brake once the other wheel is spinning so that it locks in the differential so that both wheels spin? Is this an auto differential Lock ? Ever heard of this?