• The six-cylinder 1991 Ford F-150 was offered in 11 different trims. However, only three of these trims came standard with a four-speed manual transmission: the S regular cab short bed, the S super cab short bed and the S super cab long bed. All of these trims are two-wheel drive trucks.
  
  

Engine, Transmission and Fuel Economy

• Three models of the 1991 Ford F-150 feature a four-speed manual transmission: the S regular cab short bed, the S super cab short bed and the S Super cab long bed. All of these trucks are two-wheel drive. The super cab models feature a 4.9-liter, 145-horsepower, inline six-cylinder engine while the regular cab truck boasts a slightly more powerful 4.9-liter, 150-horsepower, inline six-cylinder engine. The 145-horsepower engine produces 265 ft.-lbs. of torque while the 150-horsepower engine produces 260 ft-lbs. All three trucks have a bore and stroke of 4.00 by 3.98 inches and a compression ratio of 8.8:1. All trims come with a 34.7-gallon gas tank and have a fuel economy of 16 miles per gallon in the city and 18 MPG on the highway.
  
  

Exterior

• The S regular cab short bed F-150 measures 194.1 inches long, 79 inches wide, 70 inches high and weighs in at 3,741 pounds. It has a wheelbase of 116.8 inches and a turning diameter of 39.9 feet. The S super cab short bed F-150 measures 216.1 inches long, 70 inches wide and 71.3 inches high. It has a wheelbase of 138.8 inches, a turning diameter of 46.4 feet and weighs in at 4,116 pounds. The F-150 S super cab long bed is 232.2 inches long, 79 inches wide and 71.2 inches tall, with a curb weight of 4,229 pounds. It features a wheelbase of 155 inches and a turning diameter of 51.2 feet.
  
  

Interior

• The 1991 Ford F-150 S regular cab short bed truck has seating for three. This model offers 40.3 inches of headroom, 41.1 inches of legroom, 65.3 inches of shoulder room and 61.2 inches of hip room. The S super cab short bed and S super cab long bed trucks offer seating for six. Front seat passengers enjoy 40 inches of headroom, 39.2 inches of legroom, 65.3 inches of shoulder room and 61.2 inches of hip room. Back seat occupants get 39.2 inches of headroom, 28.5 inches of rear legroom, 67.4 inches of shoulder room and 61.1 inches of rear hip room.
  
  

Safety Features and Original Pricing

• Standard safety features on all three models of the 1991 Ford F-150 include four-wheel, anti-lock disc brakes, seat belts and a full-size spare tire. The base model had a manufacturer's suggested retail price (MSRP) of $10,398. The S super cab short bed F-150 had an original MSRP of $11,689, and the S super cab long bed truck had the largest price tag of $11,915.