1995LX, automatic. Original transmission at 262K miles (suburban metro Baltimore-DC miles). It slips instead of going into third gear. I can't get it past 3rd either, even at 4000RPM. Doesn't matter if gear selector is in D or OD. Had to drive from Baltimore City to Seven, MD this morning like that. Took side roads the whole way. No dash light, and no codes either. Fluid level and color look good. Reverse works fine. Any ideas? Also, I have no idea if my transmission is the TX or TJ ratio. The sticker that says that got obliterated by a cooling leak. Not sure exactly how to determine that, but IIRC it's a TX, and the axle code of Q on the door jamb sticker seems to confirm that.