I bought a used 1997 Ford Econoline E150 and the transmission had a throttle body. I took it to my mechanic and he did a full transmission oil flush, drained the pan and replaced the transmission filter. When he put in the new gear oil, I asked him to use a bottle and a half of lube to add to the new oil. Since then I've noticed a definite improvement in shifting and the shutter is gone.
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