Yes, I have played with the overdrive button. (not a bad ask though :)
I have also searched the tranny for any loose wires etc. Found nothing.
Thank you for the advice on the dealer in Lee's Summit. I will try that.
I have a 99 SR5, 4WD, AUTO 3.4 with 210,000 on it. It will not go into overdrive. I have replaced the thermostat with no results. I have a ScanGauge on it monitoring both tranny temp and water temp. Water temps runs 185-190 and tranny temp is in the 125 - 150 range (B&M Cooler on it).
This is...
