I recently bought another 740 D24T, the lichen-covered white wagon. Took advantage of good weather today to inspect the front X-member, which is quite a bit worse, almost a candidate for replacement but we will see what my welder friend says.
Left side was worse on this one, cracked in several different planes, and along 90* (factory) welds. I was not impressed with these factory welds.
Left side, I could wiggle the upper left portion easily with my finger!
Closeup
Front side, from below looking up.
Right side, engine mount extension
Under the grime, shows the extent of the crack
We'll see how well the welder tip can get into some of these places! Maybe time for some gussets as well.