My dad recently purchased a 2011 Z06 with the Z07 package. The Z06 does have the 1st-4th shift mechanism. I have driven it enough to figure out when it happens. If you have the throttle pretty much pinned in 1st it won't force you to shift to 4th. Only if you "drag-out" 1st. If you are driving normally in 1st and go above like 2100rpms the 1 --> 4 light will flash and when you go to shift the car into second, it slides you over into 4th. Its annoying but if you're driving normally it isn't a problem at all. I just shift the car around 2k.
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