Another common failure I've been seeing more and more of is this: Cracks around the bolt holding the 'L-shaped' trailing arms to the front crossmember. Same bolt that holds the lower a-arm in place. Seems to crack right around the washer area. It used to be a rare occurance for me to see this about 15 years ago, but these days 3 out of 4 cars I strip down have this ailment. I weld it on both sides, grind it down, then weld a large washer on the inside of the arm for reinforcement. You guys in the 'rust-free' zones don't know how good you have it......
Bob
Bob