I have a 98 Wrangler with 130K miles on it, and just recently my transmission started acting up again. This problem only happens if the engine is COLD. Once it is warmed up, it runs totally fine and smooth. If the engine is cold, it sometimes won't go into reverse, so I have to wait for the engine to warm up in order to put it into gear. It will go into drive just fine though. Also, it sometimes won't shift up and stay in the 3500 to 4000 rpm range at about 50 mph until I slow down and it finally shifts up. I had this problem before, but when the transmission fluid was changed it got completely better. It's only been 10K miles since it was changed though, so it isn't like it is dirty already. The fact that it only happens when the engine was cold and it got better when it had brand new tranny fluid makes me think that it is some sort of lubrication issue. What do you guys think?