Hi guys, I have been a perth-wrx member (thou I dun own a rex) for a whole, hoping you guys can provide some feedback.

My Evo GTA (auto transmission) is having a problem upshifting from 3rd gear to 4th gear under hard acceleration. The RPM will reach redline then drop and goes up again a couple of times before shifting to the next gear.

Its fine during normal driving.

Is it some serious transmission problem? The transmission fluid is above the required level.