What year did auto manufactuers "serialize" the transmissions with the ECU?

Joined
Jun 25, 2014
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IL
Seems like the advent of CVT's the transmissions are serialized with the ECU requiring someone with $$$ software. It's no longer just a mechanical swap. When did this become a thing?
 
as i have noted newer + more issues if you want to repair or even worse replace with another whatever, so i stay away! my new on 2001 jetta had the key code in the factory manual BUT no more so get out your wallet $$$ if you need the STEALER!!
 
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