I remember a great video that showed it working, but haven't been able to find it in a while. I like the idea, its more scale and realistic to 'actual' tank transmissions. You get the jerkiness of a real take (with brake differentials) when you turn. I'll hunt down the video.
Tiger I - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant