These U660E transmissions seem to be prone to getting issues with gear flare and other shifting related issues. I have noticed on mine that as it approaches the 100,000km mark, my gear changes when pushed hard are starting to get more noticeable on occasion. Like I've noticed when between 50-100% throttle, the change from 2nd to 3rd can be a bit sharper than before. I just figured this is because I have been too lazy to change my transmission fluid yet. It has been put through quite a bit so I would expect the fluid to be well used by now. I already have the parts to change it, the only thing I'm missing is the fluid. I will be interstate for the next 6-7 weeks, so after that I will sort it all out. I also use 'S' mode quite a bit so I reckon my gearbox has taken a beating since manually shifting an auto usually isn't the best. I'll see just how tough it is.