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Re: 91 Regal shuddering
Welcome to AF
does the car only do this at a steady cruising speed above 35-40mph? If so, it's definitely tranny related.
Take the car for a drive, but instead of leaving it in drive or overdrive, start in first gear and shift it manually. If the shuddering stops, it's probably a bad vacuum modulator in the trans. It controls part throttle shift points, as well as downshifting via engine vacuum. If you know what a trans modulator is, you can pull the vacuum line off and inspect it for the presence of trans fluid as this is a sure sign of a bad modulator.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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