10W40 - Automatic transmission clunks downshifting to 1st

Automatic transmission clunks downshifting to first on Buick Regal
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Automatic transmission clunks downshifting to first on Buick Regal. Article suggests solutions, including some unique to GM automatic transmissions
Keywords: car truck auto fix, diag, area, transmission, mfg, buick, chevy, gm, automatic, clunk, first

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