cooling needs of newer diesel engines. In 1977, Peterbilt assembled its 100,000th vehicle, a long-hood Model 359. The model line underwent minor revisions, as the cab received a revised dashboard and an optional 63-inch sleeper cab with walk-through entry (a first for the model line). For 1978, the CB300 was replaced by the Model 310. Again shared with Kenworth, the 310 was a new generation of the low-cab COE model line. By 1979, Peterbilt began to revise its model nomenclature, phasing out separate designations for single rear-axle trucks; all trucks began to use model numbers starting with "3" (regardless of drive configuration). 1980s In 1980, the Model 383 was discontinued, largely replaced by the smaller 353 and 387. To expand the vocationally-oriented 348/349 model family, a lighter-weight highway tractor (the first Peterbilt highway truck with a sloped nose) was added to the model line; the 349H was offered with a straight hood. In 1980, Peterbilt introduced the Model 397; the largest vehicle ever designed by the company, the 397 conventional 6x6 was exclusively for off-road use. Only 2 397s were assembled, one in 1980 and one in 1982. Peterbilt opened its third manufacturing facility in the United States, located in Denton, Texas (northern Dallas-Fort Worth suburbs); the company opened an 80-acre, 435,000 square-foot assembly facility. In 1981, the Madison facility began assembly of the Model 362 COE. Replacing the 352H, the 362 was the first completely new COE from Peterbilt in 22 years. Distinguished by its curved 3-piece windshield and three windshield wipers (a 4-piece/2-wiper configuration was optional), the 362 was designed with a larger, more aerodynamic cab and a larger, more functional interior. Several axle configurations were offered, including set-back front axles, twin-steer configurations, and all-wheel drive. In total, six cab configurations were offered, ranging from 54 to 110 inches in length. In 1986, Peterbilt commenced a series of massive changes within both the company and its product line. After 26 years, assembly operations ended at the Newark facility, as the company began production consolidation in Denton; at the time, Newark retained its corporate headquarters and engineering operations. Commencing a transition of the entire Peterbilt model line, the company revised its vocational lineup, as the 378 replaced the 348/349 and the 357 served as a successor to the 353. While trailing other manufacturers by several years, Peterbilt began offering raised-roof sleeper cabs as an option for the 359. For