Issue with the auto gearbox

[kobkob]

I'm having an issue with the auto gearbox, some changes up/down are not that smooth. When changing gears (automatically and manually), just before the gear changes the engine revs gets up (in exaggerated way) and only than the gear changes. (it happens mostly between 3rd and 4th gear). Car has done 150k in 5 years. I did a gearbox flush but the problem still occurres.On few occasions I have had a fault come up on the info panel that says "Transmission fault - limited gears available".
Thanks for any help in advance.

 

[kobkob]

Gearbox problem

The dealer diagnosed it and said that the gearbox need to replace.
The problem happens between 3rd and 4th gear just before the gear changes. the engine revs gets up and only than the gear changes.
I did at other car mechanic the gearbox flush without changing the pan filter. (Do I need to change it??).The car mechanic that did it say that some time its take a while (because the new oil in the gearbox) before the gearbox work out.
Any ideas? Thanks