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Can you help me? I have a very similar situation. Were you ever able to get a T87A to work in a pre-2017 vehicle?

I?ve installed a 2018 8L90 in my 2016 Sierra and have found that I need a T87A...

I?ve read from another member that in 2018 8L90 GM changed the internal PRNDL and that only the T87A is compatible with this version and newer 8L90?s. I understand this, just wondering about the T87A...

Here is my situation I?m looking for some help!

I have a 2016 5.3 Sierra with 8L90. I just replaced the 8L90 with one from a 2018 6.2. I?ve learned that my T87 will not work the 2018 8L90 so I?ve...

On the 2018 Camero, when you said ?proper engine/transmission computer? did you change T87 to T87a and upgrade to at 2018 ECU?

I?m in a similar situation with an 8L90 in a Sierra.

@sodak75 what ever came of this? I have a 2016 5.3 8L90 and just swapped with 8L90 from 2018 6.2. I?ve learned that my T87 TCM isn?t compatible so I?ve purchased a T87a. Now I?m worried that the new...

@Randallkreed what did you ever find out about this? Seems I?m in the same situation. Were you able to program the T87a to the e92 ECM? I put an 8L90 from a 2018 6.2 into my 2016 5.3. I?m learned I...