Looks like someone welded a mount to the middle of the frame web without proper support. Those can be fixed. Might take a doubler plate to do it correctly.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.