As a couple posts have mentioned, this thread really shows how a gauge - an actual calibrated gauge - can save big bucks and big worry. I set mine up to monitor transmission temp, and at the same time, like MtnGuy, to show me what gear I am in. The 6-speed automatic transmission on my Explorer shifts so smoothly that I can't always tell what gear it is in, and I can almost never spot the subtle change that happens when the torque converter unlocks.
A Scan-Gauge ($170) or a AeroForce Interceptor ($250) is pretty cheap insurance if you have any concerns at all. They install simply by plugging a cable into a socket that is under the dash of all modern vehicles.
Bill
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