Hi there guys, wondering if I should be concerned with my transmission. It seems to be slipping in the 4th and 5th gear. When I am accelerating, for example from 50 MPH, and my car is in the 5th gear, the rpm seems to rise to almost 3000RPM without downshifting, and stays at around 3000 rpm untill I reach like 75mph to 80mph, then it the rpm gradually lowers untill it matches the rpm that is supposed to be at the given speeds.
If I accelerate aggresivly, like flooring it, there is no slippage noticed. Soo, wondering if that is normal or not. Same goes for the 4th gears, I can be cruising at 1500 rpm, and when I accerate moderatly, not per say, floor it, rpm is high at 3000, without downshift, and does the same thing like described for the 5th gear.

 

sounds like the TQ converter just unlocking like it should, Any slipping you see should just be between teh shifting of gears