I have a 4L80e in my truck behind a 5.3L LS. Im using the stock computer so I cant comment on the stand alone side of things. As far as an 80e goes, its been great. I did a full rebuild with alto red clutches and Transgo HD2 shift kit. The shifts feel crisp and the overdrive is great on the highway.
Stand alone option for the 80e:
https://sites.google.com/site/sloppy...ans-controller