I'm having a problem with the solid axle on my 32-framed 29 roadster. The parallel-link four bar suspended solid axle keeps drifting to the right - by that, I mean that the axle is no longer centered between the frame rails, by about 7/8" towards the passenger side. After this happened the first time, I disassembled and corrected all the suspension components so the alignment was PERFECT. After three weeks on the road again, it returned to its off-center position. It is still otherwise aligned (see below), just off-center.

During the re-build, I made certain that the front and rear axles are parallel to each other, and perpendicular to the frame centerline; i.e., what some shops call a "thrust alignment". I also verified that the springs (a Posie's Super Slider) swing free, the caster is 6 degrees, and the toe-in is 1/16". I suspect that the camber may be off, however, because the outer edges of the front tires wear fast, especially the left front.

Any ideas what might be causing this? Anybody else have a similar problem? I'd rather not just swap parts until the probelm goes away.

Thanks,
Dorsey