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In February 1980, a power steering for the wide vehicles was added as an option, at the end of the same year a narrow 1.5 ton and a wide 3.5 ton followed. New diesel engines 4D30 (indirect injection, naturally aspirated, 90 PS [66 kW]) and 4D31 (direct injection naturally asparated or turbo charged, 115 PS [85 kW]) were added in November 1982.
The Chevrolet Silverado/GMC Sierra 3500, Ford F-350, and Ram 3500 are known as "one ton" pickups. [26] Similar schemes exist for vans and SUVs (e.g. a 1-ton Dodge Van or a 1 ⁄ 2-ton GMC Suburban), medium duty trucks (e.g. the 1 1 ⁄ 2-ton Ford F-550) and some military vehicles, like the ubiquitous deuce-and-a-half.
The California Bearing Ratio (CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering . [ 1 ]
Now names in order from lightest to heaviest, the range started with the 1-short-ton (907 kg) Model 21 and continued with the 1 + 1 ⁄ 2-short-ton (1,361 kg) Model 31, 2-short-ton (1,814 kg) Model 41, 3-short-ton (2,722 kg) Model 61, and ended with the 5-short-ton (4,536 kg) Model 101; the Model 101 only entered production during 1922. [6]
1 ⁄ 2 ton 4,550–5,700 pounds 4x4: 5,250–6,500 pounds F150 F151 "heavy" 1 ⁄ 2 ton 6,050–6,500 pounds F250 F250: F251 F252 F253 F254 F255 F256 F257 F258 F259 F260 (4x4): F261 F262 F263 F264 F265 F266 3 ⁄ 4 ton 6,200–8,100 pounds 4x4: 6,500–8,400 pounds F350 F350: F350 F351 F352 F353 F354 F355 F356 F357 F358 F359 F35P F360 (4x4 ...
The high birth rate, and the availability of cheap land caused the rapid expansion of population. The average age was under 20, with children everywhere. The population grew from 5.3 million people in 1800, living on 865,000 square miles of land to 9.6 million in 1820 on 1,749,000 square miles.