I have a 1989 Lincoln Town car. While driving my car today I noticed that it was revving a lot before it shifted, and it didn't seem like it was shifting normally. I think it was shifting into second around 30 mph then it would drive normally until it got up to around 45 mph - then it would start revving again. I was thinking it could be a transmission problem. I tried checking my trans fluid (I think it is the dipstick with the black handle to the left of the engine - it has a reddish fluid inside) and it seemed full. What could be the problem.