I have a 94 probe GT with aprox 145000 miles. Only has 1st and
2nd unless it's in drive where it stays in 1st. No speedometer
and o/d light flashes. Speed sensor or TCM possibly?

check speed sensor,,,starting in low when in drive mode,,shows tcm is working,,there is a solenoid in the "on" position....if tcm was the problem or not reacting ,,,should be in limp-in mode,,,all solenoids in "off" position.....