gearbox fault???

[tonic27]

good morning all, ive not been on here for a while(all has been well), anyway my new problem is this:- when i drive my car hard or say many long hills or with caravan in tow the gearbox starts to act strange, it does not want to drop down gears when i want to pull away, then if i put my foot all the way nearly to kick down it drops down but it drops 2 gears and revs the nuts off.

now if i drive normal town etc no probs, it seems to be when it gets warm.

any ideas??

sorry forgot to add c270 cdi 2005 sorrrrrrrrryyyyy.
thanks

Paul

 

[television]

Good morning, how about the car model and year, helps a lot

 

[tonic27]

anybody??????????

Paul

 

[BlackC55]

The atf maybe getting at bit on the thin side when very hot.

How many miles?

 

[tonic27]

its only done 30k.

 

[BlackC55]

mmmm maybe not then.

It needs to go on a diagnostic tester.