Having bought a very used (abused?) 1956 420c John Deere dozer with a 2 way POWER (up n down) blade and very manual angle, I have been pondering how best and simplest to convert to a 6 way blade ( up n down, power angle, power bevel). A commercial arangment that I have seen is the use of a ball joint as a primary pivot with a ball end link at the top of the blade, allowing compound angels in a simple manner. Can anyone put their 2 cents in on the idea of using a 3 inch gooseneck ball hitch for the main pivot? The dozer is rated at about 4500 lbs with out the blade, maby 5500 lbs w blade. Rated at about 3700 lbs push. The blade is 66 inches wide if i remember correctly. Off the shelf parts such as hitch parts would save much valuble time. The 3 inch ball that i have been looking at is rated for 30,000 lbs gross trailer weight. The trailer coupler that has cought my eye is sometning like a coffee cup that sits over the ball and is retained with a 3/4 inch pin that passes thru the "cup" below the ball end by the neck of the ball to retain the ball. If this sounds like I need to have my coat put on backwards with the sleeves tied please tell me to continue to ponder new ideas. Thank you in advance for any help with this "to be build".