OK, here is an update - The torque booster pump broke, so I had transmission rebuilt at Benchmark. So far a year and 20K miles later we have no problems.
Transmission (torque converter) went again 4 years later (2014). A complete rebuilt. The OD flashing indicates the transmission is overheating. If you continue driving, and the transmission overheats a lot, the computer will disconnect it (put it in neutral). Regardless, flashing OD light means there is a very serious problem with transmission.
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Same problem with 2000 Expy. Bought it 6 weeks ago and the OD light comes off in hilly areas. on level (or down hill) the light goes off (resets) after 2 min. Dealer stated the transmission fluid is old and burned causing internal damage due to overheating. Dealer stated I need new transmission. I am currently getting a second opinion
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