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Q: Tranny bangs when hot on 1997 Buick Park Avenue

Transmission shifts nice and smooth when cold. However, after driveing for half an hour or so each gear shifts with a bang. I have even described the shiftd as running over a railroad tract at about 30 mph. The condition is progressive from cold to hot. Im not refering to weather temp. when describing hot or cold.
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The powertrain control module may be detecting a fault and commanding full line pressure to make sure the transmission does not slip. There may be fault codes stored in the pcm, if so they should help diagnose the cause of your problem.
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