So what's out there? These trannies have been out for a while, long enough for our sponsors (or other vendors, perhaps) to crack them open and have a look.

So, where are the shortcomings? What do they do to a 6L80E to make it a 6L90E? Can these upgrades be installed in a 6L80E and increase resistance to failure?

What are the 6L80E's real limits as opposed to the stated limits? Has anyone killed one yet, and how? What was revealed when breaking it open - what died?

Inquiring minds want to know.