My wife's 73 Buick has a Turbo 350 automatic transmission. The tranny has about 120,000 miles on it. It recently began slipping a little in second gear...when downshifting going up a hill, it occasionally has problems shifting into second gear. One of the guys at Advance Auto Parts told me that his truck tranny would not shift into high gear. He added a bottle of Lucas Transmission additive and after driving it for a short time, it resumed normal operation. So I bought some but haven't used it yet. I'd be interested in hearing from people who have had practical experience with this product.