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Not that I've heard of in my nonexistent research.
I did have a talk with an aftermarket tuner who wasn't fond of the leaf spring. However, in talking to him I really took away that he had issues with the specific implementation rather than the fundamentals of the concept. He did say it was easier and more cost effective for him as a tuner to do his job using coil springs. While he didn't like some of what GM did with the leaf spring, I get the feeling he wouldn't have been any happier with the work had it been done with coils. He did state that he things GM's work is good for the majority of owners and a number of his changes had nothing to do with the springs. While he wasn’t able to improve my insight into the nuances of the leaf spring, he did at least back my view that the move from the leaf to coils has more to do with familiarity and parts availability than any fundamental flaw in using a leaf on a production car.
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