International 9000: International’s Class 8 conventional

The International 9000 series was the company’s Class 8 highway conventional, produced by International Harvester and then Navistar from 1971 until 2017. It was offered in three generations and many versions, from the Transtar 4270 with its big Detroit Diesel V8 to the aerodynamic 9400 and the final 9900i.

International 9000 at a glance

Based on one source (English Wikipedia).

History of the International 9000

First generation: the Transtar (1971–1980s)

In 1971 International replaced the Transtar 400, itself an update of the 1961 D-400, with the Transtar 4200/4300 series, which brought an all-new cab in place of the “Emeryville” cab of 1957. It was launched as the standard-hood Transtar 4270 and the extended-hood 4370. A steel cab was standard and an aluminium cab optional. The 4270 used a 260 hp Detroit Diesel 8V71 V8 as standard, while the 4370 came with a 230 hp Cummins NH inline-six and could be ordered with a 434 hp Detroit Diesel 12V71 V12. Transmissions were manual, from five to sixteen speeds, with an optional four-speed auxiliary box. At the end of the 1970s the 4300 could be ordered with some of the largest diesels ever fitted to a road vehicle, including the 450 hp Cummins KT of 1,150 cubic inches and the Caterpillar 3408 V8 of 1,099 cubic inches. In 1972 the Paystar 5000 adopted the cab of the Transtar, and the 9000-series cab-overs of 1981 took its doors.

Second generation (1984–1999)

After International Harvester became Navistar, the Transtar 4370 was rebranded the International 9370 and the Transtar name was retired; the standard-length 4270 was dropped. The cab structure carried over with a more prominent hood and grille, recognised by vertically stacked headlamps. In 1989 the 9370 became the 9300 and a set-back front axle was offered for the first time. The 9400 arrived in 1990 as a second conventional in the range: International’s first aerodynamic Class 8 conventional, with a set-back axle, a sloped hood and optional skirted fuel tanks. In 1992 came the 9400 Midnight Eagle Limited Edition, sold only with the Caterpillar 3406 and finished with a leather and wood interior and a colour-coordinated exterior. The shorter-hood 9200 was added in 1993, when the 9300 lost its set-back axle; the 9100 followed in 1997, mostly as a day cab, and that year the range except the 9300 received a new grille, bumper and headlamp surrounds. For 1999 the 9900 replaced the 9300 with a squared-off long hood and chrome-trimmed twin headlights faired into the fenders.

Third generation: the i-series (2000–2017)

For 2000 International introduced the third generation, marked by an “i” suffix. The cab kept its aluminium structure but the firewall was moved forward to enlarge the drivers’ compartment, which allowed a single-piece curved windshield with cowl-mounted wipers; the base of the windshield and the lower half of the door windows were lowered, and vent windows disappeared. The launch range was the 9100i and 9200i on a 112-inch BBC, the 9400i and 9900i on 120 inches and the 9900ix on 130 inches. The 9100i was a day cab only, and the 9900i and 9900ix had straight hoods rather than the sloped hood of the rest of the line; the 9900ix came only with premium Eagle trim. The cab was still shared with the Paystar severe-service truck, renamed 5000i. The range was then wound down in favour of the NGV-cab ProStar and LoneStar: the 9100i went after 2002, the 9400i after 2007 and the 9200i after 2011. The last 9900i was built in 2017, ending a 46-year run.

Design and features

• Three generations: the Transtar 4200/4300 of 1971, the 9300/9400/9200/9100/9900 of 1984–1999 and the i-series from 2000.
• Big engines: Detroit Diesel 8V71 and 12V71, Cummins NH and KT, and Caterpillar 3408, up to 1,150 cubic inches.
• Aerodynamics: the 9400 of 1990 was International’s first aerodynamic Class 8 conventional.
• i-series cab: a forward firewall, curved one-piece windshield and lower glass for better visibility.
• Shared cab: the same cab served the Paystar severe-service range.

International 9000 versions

• Transtar 4270/4370 (1971): standard and extended-hood versions of the first generation.
• 9370 and 9300 (1984–1999): the long-running long-hood conventional.
• 9400 (1990): aerodynamic sloped-hood conventional; Midnight Eagle edition in 1992.
• 9200 (1993) and 9100 (1997): shorter-hood and day-cab versions.
• 9900 (1999): squared-off long hood with chrome-trimmed headlights.
• i-series (2000): 9100i, 9200i, 9400i, 9900i and the Eagle-trim 9900ix.

The 9000 series sat above the International S series and shared its cab with the Paystar; its successor in the range was the ProStar. More trucks are in the International collection.

Sources

• International 9000, English Wikipedia: generations, models, engines, production