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I have a 2001 Discovery II and when driving at 50mph (or 40 or 30) but a constant speed, my transmission just shifts to 3 and sometimes 2 and back with no incline or gas fluctuation. Just does it while driving. Does anyone have any reason why?
you probably have some trans error codes...did you check?
the plug that has a screw retainer into trans can come loose...
last trans fluid / filter change?
bad XYZ switch?