Thanks guys. I took her back to the shop yesterday. They did some tests and said they highly suspect 4th gear is completely gone. And I don't think I've hit 3rd in a few days either. Do you guys have suggestions as to a rebuild or replacement? I'm not sure which is better. I'd rather pay more and know all the stuff is new and going to last for a long time than to have it replaced with a tranny with several miles on it knowing it might have the same issue in a year or two. I heard bad things about AAMCO or whatever. The previous owner also said he'd shoot me a few hundred bucks back since this happened so soon, although he isn't responsible at all and I don't believe he ever had issues with it. I'm thankful for that. But I'm just not sure about what my best option here is.