On my 38 the springs are part of the problem. On the front one spring has a very noticeable arch compared to the other. PO told me when they put the body on it that I bought it with and loaded it it set down on the tires. They jacked it up and started adding leaves to the springs until it held the load. Counting them the rear has a different number of leaves on each side. Part of my problem was also cab deterioration. Since we had the rust removed and cab stabilized things are much better.
