Mine never cracked, but the bolts came loose all the time. I just did crossover and built a new one simular to Depdogs, but out of 2 X 2 X 1/4 tube instead of 1 X 2 like Dep. I also bent mine on a tubing bender rather than segementing it like Deps. I like the way it turned out. If I had a digital camera I woudl post a pick of it. I dont think that you can just get one out of the junk yard though. I had to cut my old one in half to get it out from between the frame rails. As far as line up it is not a problem. Just take a floor jack with a 2 X 4 and gently jack up the motor at the harmonic balancer to realign the holes. You can see the one Depdog made on the main page under project vehicles I believe.
I thought I was wrong once,
but I was mistaken