I will be following this thread as well
Have you had someone scan for the CEL codes? I had the same issue awhile back that seems to be resurfacing. Transmission doesn't want to engage any gear at times? Auto trans has the manual-trans-that's-slipping-a-clutch feeling when changing gears? I replaced solenoid in the trans-pan and that fixed it for the time, but, like I said, the issue is surfacing again.
Don't know if it's the same problem or not this time. I haven't run the codes again yet, I'm waiting til my next paycheck to get an SCT Tuner so I can run them myself. If it turns out to be the same problem, I might wind up getting a new/upgraded valve body from Lentech that should be able to handle more stress.
Anyway, I'm going to subscribe to this thread and I'll let you know what comes of my situation to see if it can somehow help yours!