2000 Dodge Intrepid with 3.2 liter engine. On starting yesterday, speedometer stayed at 0 and transmission, after starting in first gear, wentto second at a few mph and locked there. Engine light also came on. Based on searching this group it sounded like speed sensors. Local shop indicated computer showing codes P0700, Transmission circuit failure, and P0731, Ratio Error - Input doesn't match output. Based on that info they replaced both input and output speed sensors and reset the error codes. Got the speedometer working but still goes to second after a few seconds of driving and locks there. Unfortunately, no engine light and no error code (engine light does come on briefly when starting as usual). Sitting idle immediately after starting, I can go to "auto stick" mode and shift back and forth through first, second, and third but still jumps to 2nd after a few seconds of driving. Any ideas where to go next? Car not worth spending substantial $$$.