it was based upon the DeVille, the Sixty Special included eleven items as standard equipment, while those eleven items were optional at extra cost on DeVilles. There were options for the Sixty Special, that were unavailable on the DeVille, such as "Memory Seat" for the driver with two recall settings, an "Exit" button" when pushed automatically powered the driver seat all the way rearward, and dual front seat power recliners. Both the Fleetwood and DeVille were coded as C-bodies in the fourth digit of the VIN. The fifth digit coded the DeVille as "D" (with the later Touring Sedan becoming "T"), the Fleetwood as "B", and the Fleetwood Sixty Special as "S". The Sixty Special became the "G" code for 1991, and switched back to "B" for its 1993 run. Transmissions included the THM440 T4 (1985–1986), the 4T60 (1987–1989), and the 4T60E (1990–1993). Rear-wheel drive 1993–1996 For 1993, the Fleetwood model moved from the de Ville's front wheel drive C-body to the newly revised rear wheel drive D-body, used previously by the Cadillac Brougham. It was one of the first American front-wheel drive vehicles to be returned to rear-wheel drive.{cn} At overall, the Fleetwood was, at the time, the longest production car made in the United States. All Fleetwoods except for the commercial chassis had standard antilock brakes, traction control, and dual front airbags. In 1994, Cadillac used the Corvette-derived LT1 engine rated at along with the new 4L60E automatic transmission. Between 1993 and 1996, the Fleetwood commercial chassis was used instead of the de Ville for most funeral coaches and limousines produced during these years. The DeVille was used again in 1997, after production of the Fleetwood ceased. After 1996, the Cadillac Fleetwood was retired by General Motors along with all other rear-wheel drive sedans, and the assembly plant was converted to truck production for the Chevrolet Suburban and Tahoe because of the increasing demand for SUVs. The Brougham option package included a full vinyl top, C-pillar badging, specific seat design with six-way driver's seat memory, and heated three-position lumbar front seats, instrument panel badging, rear-seat vanity mirrors, and rear-seat storage armrest. The full vinyl top could be deleted from the package, and the seats could be upholstered in either Prestwick Cloth or leather. Other options included a CD player, a full-size spare tire, a sliding glass moonroof (dubbed "Astro roof"), chrome wheels, a security package, and an automatically