BlueChipper, are you interested in buying a 55.1 3600? I guess I am a little too fond of saying that my first antique Chevy truck was a 55.1 3600 pickup. Many times I wish I still had it. And by the way, 55.1 3100 1/2-ton trucks still had the rear axle above the spring, but without the pivots required for the torque-tube axle.