The picture of the toplink chain and constant-height chains are attached, CBD. The tractor is a Ford Jubilee, so the geometry is surely different from today's compact tractors, but the theory is still the same. On the right-side chain, I put the attachment on the inside threaded portion of the three point hinge-pin and then put the nut & washer on. That left me enough room to but the stabilizer bar on so when I lift the cutter and the chains get loose, the mower doesn't flop from side to side. On my NH (and I suspect on your JD too) the stabilizer is an integral part of the lift arm, so you would not have to do this. Also, my Ford has a toplink positioner on the tractor that has three holes for pins. I used one hole for the toplink chain attacment and another for the constant level chains. If I had three hands, I could put them all on one pin./w3tcompact/icons/wink.gif This setup works good for me. It's not meant to be the do-all end-all fix, but it just might help someone else struggling with the same difficulty. Remember, if you are going along pretty fast and hit something buried with the front of the mower (rock, old post, etc.) there is nothing to keep the rear of the mower from kicking up except the pto drive shaft. I've never had this happen, but in theory it is possible. Hope this helps.
JimI