AFAIK, the rattle issue has to do with when one piece windows are open at speed since, when open, they no longer have the reinforcing front track support from the bottom of the window opening to the top of the window opening.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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