[Motor31]

Have you had any tire changes? If so did they jack up the axle inside of the spring mounting point on the axle? If so then there is a good chance the axle that was jacked up was bent. They are pretty thin walled axles and can't tolerate being jacked up in that manner especially with the tire being elevated more than just clearing the ground.

I've already had to change an axle because of that very situation.