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Most Turbo 400s went into Buicks, Oldsmobiles, and Caddies. Many "car"/two-wheel-drive cases were lighter-duty "K" models (right). Turbo 400s for towing should always start with an "HD" housing (left). (The transmission has also appeared in Jeeps, Hummers, Jaguars, Ferraris, Rolls-Royces, and Bentleys.)