I believe for stock the Dayco is good. Check your area for a shop that can rebuild your converter. We have a shop here in Houston that will. And, he can custom tweek the stall while he's in there. Other than that your looking at buying one
I think im set on getting a master overhaul kit from monster trans site. come with everything. I ordered a manual for the 4l80e to help with the rebuild that i will be doing on my own.