54 big truck,
I had the same question myself. I went to the local blacksmith/spring shop where they make them to order...I asked what material they used. They told me they use 4140. I made my own out of 4140. I don't actually know what a stock u-bolt is made from but Crenwelge might be correct.
Stuart
Last edited by atomarc; 11/05/2008 10:30 PM.
