Here is a link to TCI website:
http://www.tciauto.com/tc/200-4r-700...iring-kit.html
It allows the Torque Converter to lock up in 4th gear on non computer controlled vehicles. Also forgot ot add transmission came out of an 88 Caprice and has approx 40,000 miles on it. If your looking for something newer i'll understand if you pass.