The International PayStar is a severe service truck manufactured by Navistar International.
The PayStar is marketed to heavy duty truck operators in the construction, oil exploration, and refuse collection industries.
The PayStar was introduced by International Harvester in January 1972, as a construction-specific versions of the conventional Transtar.
From 1972 through 1980 the Paystar was offered in two ranges, the 5050 with mid-range engines, and the 5070 with heavy duty engines.
Available as 4x4, 6x4, and 6x6, they were usually straight trucks, but most offered trailer brake options.

International Paystar 5000 6x6 Fire Tender at Marine Camp Pendleton LCAC base, California, in 2010.
Paystar-5050 Front axle: Rockwell FDS1600 16000 lb standard 1985, Rear axle: Spicer G400 40000 lb standard
International Transtar The International 8000 Series, also known as the International TranStar line, is a regional-haul tractor. It is available in two variants.
They differ in engines, drivetrains, and axle configurations.
The predecessor of the first Transtar was the 1965-68 CO-4000 (which was replacing the DCO-400 Emeryville).
In 1968, the company unveiled the Transtar, also known as CO/COF-4070A and as COF-4090A (with a raised cab).
An all wheel drive model was made on the Transtar basis from 1970 to 1972: the Unistar, or Universal four wheel drive with no transfer case. This truck has a modified grille, bumper, and front corner design.
The Transtar was replaced in mid 1974 by the Transtar II, a.k.a CO/COF-4070B
International Unistar
The Unistar, billed by International as the Universal Highway Tractor was based on the Transtar CO-4070A 4x2, but with a modified grille, bumper, and front corner design.
ItТs main feature was a driving front axle with overrunning clutch to give it excellent traction in all conditions. The engine was the Cummins NTC-300, a special Уtorque-balancedФ variation of the NTC-335. The standard transmission was a Fuller 9-speed with up to 13-speeds optional. The Unistar could be combined with a Jifflox trailing-axle converter so that it could be switched quickly from 4x4 to 6x4 layout. The engine offerings for the Unistar were expanded in 1972, to a range of Cummins diesels from 255-370 hp and Detroit Diesels from 260-318 hp
Unistar Unistar didn't stop there - it had a 'split bogie axle' to give the tractor 4x4 capability, so the same truck could be operated in either 4x2, 6x2 or 4x4 configuration.
Unistar Unistar didn't stop there - it had a 'split bogie axle' to give the tractor 4x4 capability, so the same truck could be operated in either 4x2, 6x2 or 4x4 configuration.
Workhorse brand chassis Navistar International Corporation (NYSE: NAV) (formerly International Harvester Company) is an American holding company that owns the manufacturer of International brand commercial trucks, MaxxForce brand diesel engines, IC Bus school and commercial buses, Workhorse brand chassis for motor homes and step vans, and is a private label designer and manufacturer of diesel engines for the pickup truck, van and SUV markets. The company is also a provider of truck and diesel engine parts and service.
In 2005, Navistar purchased the Workhorse company (started in 1998 by investors who took over production and sales of General MotorsТ popular P-series Stepvan chassis when GM dropped it), a manufacturer of step-van and motor home chassis, to seemingly re-enter the delivery van market.
It appeared that the new subsidiary might also benefit by its association with a company whose history from the 1930s into the '60s included the popular Metro van. For a short time Workhorse offered an integrated chassis-body product called MetroStar. In Sept. of 2012, Navistar announced the shut down of Workhorse and the closure of the plant in Union City, IN in order to cut costs.
International Harvester - Binders Big and not so Big International Harvester always maintained an interesting niche in the truck business. Known for their indestructibility, they were also looked down upon by some as farmers' trucks and were called "Binders" due to their farming ancestry (from corn-binders, an early International Harvester product.) As an independent truck builder, they were an extremely large producer (120,000 to 150,000 units per year in the 1960s versus 20,000 for Mack) over the full range from pick-ups to highway trucks and many mid-size trucks of the class 5,6,7 variety, also 4x4 , 6x6, military and other unusual vehicles. They also built trucks in Canada in Chatham, ON (where I lived for a time) and were well represented in the cities and on the highways of Canada. Over the years they gave up on pickups, changed their name to Navistar International and sold off the tractor business.They are still a very big company, with a huge range of sizes and types available. They are no longer built in Canada however.

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