strange sound from auto gearbox during hard acceleration

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1998K

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Italy
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W203 C270 cdi
Another question!:bannana:

Since I'm not used to automatic transmission I'd like to know if is normal to hear a typical sound during hard acceleration.

It's a sort of "grr" :confused: that lasto for a second only if I push hard on the gas, may be it's normal sound from the gearbox due to fast gear change or from the torque converter.

A part this the engine/gearbox run very well without any sort of hesitation, acceleration and gear change is very smooth.

Any idea will be much appreciated

Hi:)
 
Not sure if that is normal at all.
 
Perhaps it could be the exhaust?

Try driving it with the windows open, alongside a big tall hard wall so the sound bounces back to you.
 
just make sure it is alongside the wall and not at it
 
thanks a lot for your reply and suggestion, I take care and better I'll check with the mechanic
 
Could be the torque converter.A known isue one 722.6 gearboxes.
Starts with a gromming sound when you push the trothle from low revs.

Carlo
 
Could be the torque converter.A known isue one 722.6 gearboxes.
Starts with a gromming sound when you push the trothle from low revs.

Carlo

thanks, it's may be a problem or only a typical sound should I worry in case?

thanks:)
 
Mostly it results in a slipping gearbox.Bad for the friction plates in the gearbox.
Go to the stealership and ask for a warranty...Asking costs nothing.

But ! Not sure it is the torque converter... check out the other things like mentioned above ... exhaust etc ...

Carlo
 

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