My trans is acting all kinds of weird, jerking and shuddering, but if I turn the overdrive off it's fine. I originally got P0734 gear ratio error in 4th. I reset it, and as long as I don't leave O/D on it's fine. My search results seem to be split down the middle between it being the output speed sensor (wasn't that, tried it already) and grenade waiting to happen. I just don't get why the rest of the trans seems to function completely normal but O/D is f*cked. Figures it's right before I leave for another 2 months. Any ideas/opinions?