Hi Weasel,
Thanks for your reply,It doesn't shudder in the S mode.
The Module was re-flashed,should it fix the soft glitch?
Anyway,I am thinking to change the differential fluid,as one of the guys suggested to do so.
It doesn't happen all the times,but it's a city speed range,40 km/h so I face this once or twice a day per say.
My another concern is,should it damage the tranny,I am worried,yes I've got a warranty on it 40.000km or 24 months,but if that shuddering keeps slowly ruining the tranny I may get to the point of no warranty and no tranny in the near future.
About the module,is it expensive one? should I go with new or a used one would work just fine?
I made 2500km since the rebuild and 1000kms or so I noticed that when I drive it cold I can hear that torque converter or something squeals during the shifts,once it gets warm it stops.....weird isn't it?