This thread is still going so I thought I'd put in my 5c (my cents have been adjusted for inflation) I've been through the entire gambit. My Denali transmission and engine failed immediately after the warranty expired. A new turnkey long block 6.2 runs about 14 K.. A used turnkey long block runs about 6k now.. I got an entire used powerplant; ecu's + harness connected to an engine and trans for 6K. I forget the mileage, it was low.
Thats still cheaper than a new vehicle.. Or a used running one. I should have saved a ton of $ and used a 5.3... But I digress..
I rebuilt the ebay engine and stock trans and then reprogrammed the trans with bluecat to not lock the converter up until 50mph and zero'd out the slip. It's been about 15K now no issues. I still have an 8L90 left over from that job. Maybe I'll put it in my F350 when that engine dies..
My point is, reprogram the trans so it's not always slipping the converter. I know you have a warranty but I think it's stock programming that's the problem, not the hard parts themselves.
