Mitsubishi Repair: 95 daimante wagon v6 overdrive, overdrive switch, transmission shop

Question
i was going up hill in overdrive about 45 mph and overdrive just went out . will not work at all now . the other gears work but i have to drive slow (rpms get to high) . plus i don't want to do more damage . what could it be and about how much will cost , is it an easy fix i can do myself with out tearing it apart ? thank you for your time ....  

Answer
Mike,
This may be a bad overdrive switch or malfunctioning electrical connection.  It's hard to give an estimate on a repair cost, and that ca vary significantly based on the actual problem.  I would recommend you have a transmission shop inspect the drive-train and diagnose the problem; even taking the car to a couple of shops for estimates would not be a bad idea.  You shouldn't cause any any further damage by driving without overdrive.  As long as the RPMs do no go past the red line, you should be fine.
Good luck!