Mike, there are hundreds of Panteras driving around with fabricated rear upper control arms and many others with fully fabricated suspensions, including some machined from aluminum billet. The only suspension failures I've ever heard of were all caused by a failure of a suspension mount, either due to poor welding at the factory or corrosion. Keep in mind, when our cars were built, the manufacturer never anticipated the forces exerted on the chassis by our present day 18", 19" or even 20" tires and/or our modern brake upgrades.
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