Whether it is or not though, it's absolutely the reason why you have play in your steering. I know, you didn't say you had any; but if there's play at the pitman arm joint, then you do. I've heard some people say you can't get that joint, and have to replace the whole pitman arm. It isn't true, I got the joint from Chrysler this past summer. Taking that play out will make it 100X easier to drive in a straight line, something I always took for granted until I found myself racking up miles in an old Dodge.
As for the death wobble, it's more likely caused by the poorly designed steering box mount. Many companies offer a reinforced setup that pretty much clears up the problem.