O/D light blinking after 20 minutes

O/D light blinking after 20 minutes The O/D light on my 2004 Ranger with a 5R55E transmission is blinking after about 20 minutes of driving. The code is P0735, "gear 5 incorrect ratio." It shifts fine before the light blinks. Even after it blinks, it drives fine in gear 5, but once the light blinks, shifting is abnormal. Might changing the TR Sensor help?