2000 Ford F350 RADICAL STEERING

I have had the frontend completely rebuilt by the ford people including the replacement of the steering box and the additionof a steering dampener which it never had before. I have had it lined up at two different dealerships and it still is not right. So far I have 2900.00 in parts and labor and you can hardly keep it between the lines. It is so radical I am almost afraid to drive it. It is so much different now than when it was new you would think it was a different truck. I took it back to the last dealer and they just flat refused to try to fix the problem. Also the first dealer said the steering box was ok when they checked it. All of these repairs were done within a month and 5000 miles. I also took it to an independant frontend shop and they checked the alignment and said the ball joints were torqued too tight and they retorqued them and it helped but it still is not right. Thanks in advance for your advice. John