Auto trans Lock up convertor question SLK 230
 

In the SLK230 1998 does the torque convertor have a Positive lock or does
it allow a bit of slippage when throttle applied (No gear change)

Mine at 100kph in top raises revs up 200rpm when throttle pressed gently.
Revs drop back to match vehicle speed when back on cruise.

Is this normal? Any one try theirs for me to check?

Bazzle