Crosley. 10703 posts · Joined 2002. #3 · Aug 4, 2007. Berliner Bel Air said: I bought a 1955 Buick this year. When I bought it the TH350 (350 SB Chevy engine) did not kickdown. It shifted very soft too. So I had a Transgo shift kit installed by a friend. The shifts are very nice now, crisp, and it will kickdown from 3rd to 2nd gear when I ...