I just converted my 2:56 peg leg to a 3:55 posi in my 68 Lemans. My God what a difference, like adding 100 more horsepower. Little tough on highway tho running close to 4 grand at 65MPH. Looking forward to seeing what it will do on the strip with the big block pushing 400 h.p.by monkbutt - Pontiac GTO Forum