That could be part of it. I had 39's on my '78 with just the normal frame breakage, never had a rag-joint problem. That frame broke when I was driving it in the city and the steering got bad really quick but it was still steerable. I was able to limp home and get it fixed later. I know that dumping the rag joint is probably a good idea when tires get bigger. But the replacements used to be spendy. I believe it was Flaming River that sold replacement joints to eliminate the rag joint. They used to be in the couple hundred dollar range which is why I never did it. I made the poor mans rag joint for my present truck until I was able to buy a real one. Highly inadvisable I might add.
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