Here are some pics of my frame. I have removed the exhaust in pic 1
pic 2 is the hole I found in a cross member. I had noticed that the passenger shock mount was bolted on and not riveted as the other side was. Also there was a couple of pieces of steel on the backside of the crossmember. When I unbolted the shock mount I found the hole.
Pic 3 is the hole cleaned up. I think that the steel actually cracked due to some of the really clean cracks. It look like the steel was defected there. Anyway it will get replaced.