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 - Talk of the Town: What's The "Stuckest" You've Ever Been? - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I was about 14 (part of the problem) when I got stuck. I was disking with a cab equipped IH 966. The window was dirty and I was driving into the evening sun. It was hard to see and it was my first pass down the field. I got the tractor so stuck that the underside of the tractor was resting on the ground. My uncle wanted
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