HELP ! ! ! My O.D. light suddenly started blinking. Then it goes out for a day. Then it randomly will start blinking. when it's blinking, the transmission seems to shift really hard(i.e. slamming into gear too hard). Are there any switches or modules or relays that might be causing this ? Do I need a tranny flush ? Tranny service ? And what exactly does a tranny service entail ? Please help.