Has anyone successfully used the USCartool A500 Crossmember?

Not a thing. It might make it a little easier to get onto the upper bell housing bolts. But I was able to get them pretty easily by unbolting the transmission crossmember, letting the trans down a bit and then I was able to get to those bolts quite easily from the bottom, with a very long extension and a swivel socket. Before tilting the engine/transmission down at the rear, I removed my distributor just to make sure it didnt hit the firewall. I let it down just about to the point that the oil pan was going to contact the steering drag link.
cool, just like any other 727, at least on that end