My 850T5 Runs around 2200, 2500 at 70 mph. If you have an auto it has four speeds. The manual says that a lock with a reduction of RPM's indicates that it is in 4th. Overdrive per se. You might want to do a trans flush and see if it will loosen up your tranny. It may not be able to shift into 4th.
If you have a stick? I dont know.
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