What TCMs need to be sent in to unlock?

What TCMs do we need to send in to get unlocked?

I think that all TCMs 2017 and newer are locked until made otherwise. No totally sure about ALL of them. Even through T87 has been around since 2014 or so, in 2017 GM introduced the T87A, similar but with the ability to lock you out of editing and unreadable.

2017+ 6L80e TCM's do not require this service, just to give more information. Those use different TCM's than the 8 and 10 speeds.

So would a T87 from 2016 need to be unlocked? On a 8 speed C7 z06?

No, because that is not a T87A.

The website says it's for T87A's only.

Thanks guys