ok so my gearbox has been playing up lately. slipping a bit on takeoff and changing between 1-2 i realised i was running a bit low on fluid. so i topped it up. worked alright when i took it for a quick spin. but today it had similar problems again. accpet now it has a bit of a shudder in it when changing gears under any decent throttle. i noticed the check engine light was on about half way home and it was struggling coming down the hwy at 100. i dropped it back to 3 and it seemed good.. apart from revving a bit high. then when i went to put it back in D it changed but didnt drop the revs. and just slugged along. so i drove home the rest of the way in 3 and it was great. great changing between 1-2 and no shuddering at all. ive just checked the error codes via help of this thread and i got a code of 68. which translates to - Transmission Component Slipping - Auto Transmission Only. ok now i obviously knew it was slipping. just wondering how to fix it. would to much trans fluid cause this or is my gearbox stuffed? cheers for any advice.