AMT is a unreliable transmission. It's a manual gearbox with grar shifting and clutch control by a computer. Computer is not good at controlling clutch in stop and go traffic and hills and usually end up half pressed clutch which will cause clutch wear.
That's why those not used by most car...
Anyway, you cannot transfer a vehicle without providing TIN number. So, it does not matter whether you pay in cash or not, IRD will know that you purchased a new vehicle.