Hello Mr.Scotty I have a Toyota Corolla petrol engine 1600cc automatic transmission.Every morning when I start the car and run it takes quite a long time to change from 3rd to 4th gear in automatic transmission.Also the engine RPM goes up to 3000 then the gear shift happens to 4th gear .
This is if I start and drive continuously without reducing speed.Whereas if I halt for some time in signal or brake n slow down It does not happen.What could possibly be the cause.I am in Qatar middle East high temperature reaches uptown 50deg centigrade.Please advice.

transmission is just flat wearing out inside. baby it or rebuild it

ARE You sure sir.It has completed just 40000 Kms only.Wont it be transmission fluid??