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I also find it a little scary too, but working on Reattas are fun, right?

Bertimus - I will share what works for me: drive your Reatta in Drive not Overdrive!! Think about it ... GM added an overdrive which works great at saving fuel when driven at 55 - 60 mph over great distances. That should be the only time that we use OD, the rest of the time the Reatta was designed and engineered to operate in Drive! I could be wrong (I often am wrong according to my wife!) but most drive ability issues fade into the sunset when we use the transmission as designed!!

Analytical mind at work? That does lend support for the engine/trans moving around. Has your mechanic checked the drive axles for play? Usually axle issues give a noise or vibration indication and are generally very reliable, so just a question at this point.

I will try that as soon as I get a chance! But I made an interesting observation today: The slight jerk very much seems to only happen when the road is level or on a decline. I did not notice it on inclines. And like before, it doesn't not happen at all at slower speeds.

Start the engine and make sure it is up to normal operating temperature. Enter diagnostics. Wait for any codes to be displayed. Then select ECM when asked. The photo below shows the ECM diagnostic screen. While driving watch the triangle over TCC in the bottom left corner. The triangle will illuminate when the ECM is calling for the TCC to lock and go off when it unlocks.

Okay touch screen guys, can you answer Bertimus question? I know there is a screen that shows the TCC indication but I am not a regular user.