Could be the left front motor mount. Or any mount, including transmission. A separated motor mount will let the engine rock excessively when the transmission shifts and then thump when the engine settles back down.
I had the same thing happen on an Olds 88 and it was the left front mount. (Same transmission as the Buick).
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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