Did it do it under hard acceleration? or just a normal take off. I have heard of engine mounts or tranny mount bushings getting old (not mileage old but just aging) causing a thump or clunking sound in between shifting. What happens is the tranny actually hits the undercarriage of the vehicle during high torque situations such as shifting gears. I have also seen the mount retaining nut back off of the mounts and the only thing holding everything in place is gravity. Another possibility is drive shaft u-joint problems, but if it were it would probably be making the noise more often. I dont think there is actually anything wrong with the transmission itself as usually when they go bad they dont magically get better. Hope this helps. Good luck!
SOURCE: 1996 Cadillac Seville started shifting hard all of a sudden
Sounds like a broken acumulator spring inside the unit...If it is, usually it has to come apart, unless it has an external servo cover for the broken one.
SOURCE: 1996 Cadillac Seville started shifting hard all of a sudden
The pressure control solenoid needs to be replaced. It"s under the side cover on the transmission on drivers side. Not a simple fix at home. You will also need a side cover gasket. The transmission does not need to be rebuilt.
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