Hi Jason what you here is not a slipper clutch for when stress is on the gearbox...what it is is a slipper clutch that keeps tensin between both drive motors in the gear box so the tank will track straight even if one motor is slower.... they use this because there is no trim to straighten out the tank because they are not fully proportional....If you get the sound tanks from VS you don't notice it.

Titan20 the hum of the marui tigers gear boxes make it sound like it has a motor in it don't it.