Ed Wright of www.fastchip.com is highly recommended to solve the computer problems of the OBD1 and OBD2 that are used with the 4L60E transmissions since 1993.
If you have a 4T65, EV/GT transmission, Talk to David Norris at Triple Edge Performance. They offer stock to highly modified 4T65Es, upgraded parts, solutions that work, and technical support to assist the do-it-yourself customers, before - during - and after the rebuild. Go to: http://tripleedgeperformance.com/Home-Page.html They will give you the best information for the 4T65E transmission.
If you are looking for a “A true plug and play design” transmission controller. Go to: http://etranscontrol.com/ They are the home of the most simple to setup transmission controllers for after market or OEM. Works with GM 4L60E to 4L80E, GM 4T45E to 4T80E and Dodge 47RE & 48RE transmissions.