I bought a 96 Eddie B. I got it at a deal but it has been wrecked before, the repaires were un-noticable, and it looked great. One problem it dog tracks just a little. The axle's look fine and I have no vibration's. Couldn't the whole rear-end be shifted a little? If so how can I fix it?
I'd take a close look at the front end, the TTB does not fare well in impacts, either from the front or the side. In particular take a close look at radius arms, pivot brackets & crossmember and the TTB beams themselves.
Like Sixlitre said take it to a good alignment shop but ask for either a four wheel alignment or a "thrust angle" alignment. No matter how bad the front may be off it won't cause dogtracking. That's all in the rear. Anything from a worn out leaf spring bushing to a bent shackle mount. Best of luck to you.