I gave my daughter a 1990 240 with 190k on it. After approx. 5k the overdrive failed. I replaced the trans. with another and the overdrive failed after 2k. The second trans. had 180k on it. Both trans. shifted properly in all 3 gears, just would not shift into overdrive. Any thoughts on the possible problem? Were there any problems associated with the overdrive on these trans.?