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I recorded a video showing that: http://youtu.be/JBEE84u-cCE
I also can see that the pointer of RPM meter is "shaking" in the same time - like it didn't know where to setlle
Grinding Tranny is set to "1" and the gearbox upgrade is a "2 pedals" one. But no matter if I switch off the Tranny or which upgrade of gearbox I use - there is still the same strange sound.