I installed my TransGo kit almost 5 years ago (100,000 KM). Still going strong, for a sloppy a$$ hi-mileage tranny. LOL
You could last just as long, or longer, or less. It is a crap-shoot depending on what really is wrong inside the tranny.
Read this too if you haven't already.... http://www.grandprixforums.net/threa...Shift-Solution