Hi,

i have seen this problem now on all Camaros that we had on dyno and all customers complain about it.
No matter if in manual or automatic mode, as soon as you get over 230 km/h (143 mph), it shifts from 6th back to 5th gear.
Part throttle, full throttle, always.
It is simply not possible to drive in 6th gear over 230 km/h (143 mph). You also cannot shift manually to 6th gear, it simply does not allow it.

Does somebody see more than i see in the TCM file? I cannot see a reason why it does this.

Note: its not a single car issue, they all do it, aslo with other TCM calibrations.
Camaro_TCM.tun