The 6L80 - torque converter question

[s10dragracer888]

My 2020 custom trail boss with the 4.3/6l80 has had 2 torque converters put in it.
 

Here are my questions.

 

Can I put a performance tcc in from a v8?

 

What is the stock stall speed?

 

Would a higher stall cause an engine light?

 

What size is my torque converter (I was told 258mm)?

 

I know the flex plates are the same up to the 6.2….same parts numbers referenced in the schematics on GM parts Direct. I can’t tune the TCM without swapping the valve body and TCM from an ‘18 or earlier truck.

 

When speaking to a transmission specialist at master transmissions, he said the most common cause is the torque converter locking up in every gear and eventually giving up. He suggested one with firm lockups (multi-plate) and stay close to stall speed….but go slightly HIGHER for v8 converter behind my v6.

 

Anyone have any suggestions? I don’t want to have to trade my truck in. I just want to nip this in the bud before it becomes a problem. Again.

[Grumpy Bear]