1998 International 4000

International Harvester (later Navistar International) built a series of trucks between 1977 and 2001 known as the International S series. With the advent of the S series, the IHC Loadstar and IHC Fleetstar, both of which are medium-duty trucks, were merged into a single product line, replacing the previous IHC Loadstar. This article focuses on the 1998 International 4000.

Straight trucks, semitractors, vocational vehicles, and severe-service trucks were among the many options for the IHC S series. Aside from that, the S series was available in various body styles, such as a four-door crew cab, an extended cutaway cab, a cowled chassis, and a stripped chassis. They were available in two, four, and six-wheel drive variants, with gasoline and diesel engines (the latter only until 1986). The chassis may have a single or tandem rear axle and two, four, or six-wheel drive, depending on the configuration.

A last-generation product line developed by International Harvester was produced in its original form until 1989. In 1989, the S-Series was restructured into distinct model lines. New Generation Vehicle (NGV) designs debuted in 2001, with a broad range of service and bus chassis changes being made in the following years until the end of 2004.

1998 International 4000 Performance and Fuel Economy

Single and tandem rear axles, 4×4 and 6×6 drivetrains, and a choice of colors, were all available in the 4000 series, which replaced the S1600 through S1900. The 4000 series was powered only by IDI V8 and DT360/DT466 diesel engines. Until 2001, the 4000 series was manufactured before being superseded by a new 4000 series released in 2002 (now the International DuraStar).


The S-series model line had a significant overhaul in 1989 as part of a standard update. The cab’s construction was not altered; nevertheless, the inside and outside of the cabin were completely redesigned. The model line was given a lower hood line and fenders closer to the body to increase aerodynamics. An updated instrument panel and a two-speaker steering wheel were part of the dashboard makeover. A few significant changes were made to the second-generation vehicles throughout their production life. Although the vehicle’s exterior design mainly remained unchanged from 1989 to 2001, International’s instrument panel was completely redesigned in 1992 and then upgraded throughout the vehicle’s interior in 1995.


International created three separate model families for the 1989 model year, each of which has the same cab structure. While the Class 7/8 tractor range was covered by the 7100/8100 series of trucks, the 1998 International 4000 operated as the medium-duty truck range. Although they were still in production, the S-series badge was dropped from the 2500/2600 severe-service trucks. S1600–S1900-based 4000 series vehicles were superseded by 4×4– and 6×6–wheel drive 4000 series vehicles. These vehicles were available with several drivetrain options, including single or tandem rear axles and single or tandem front axles. Only the 4000 series, which was powered exclusively by diesel engines, used the IDI V8 and DT360/DT466 engines. A new 4000 series was produced in 2002 to replace this series, which was discontinued in 2001 (now the International DuraStar).

1989 saw the introduction of the 7100 and 8100 models, which replaced the wide-body S2100 and S2300, respectively, although the wide-body S2200 was left out. For the 8000 series, the Cummins L10 diesel engine was the main power source, whereas the Detroit Diesel DT466 powered the 7100. As of 2001, all 8000 models have been phased out and replaced with the all-new 8000 series (now the International Transtar). When Paystar 2500 and 2600 severe-service trucks returned to their previous place below the S-series, the S-series prefix was dropped. The aerodynamic bonnet from the 8300 was used on the set-back axle 2674 throughout the 1990s. A school bus chassis, the 3800, was the only other model to endure longer than 2500/2600.


  • Engine type: Cummins
1998 International 4000

1998 International 4000 — Owner’s Manual

When it came to a 1998 International 4000, the owner’s manual included all of the important details about the vehicle’s future operation and maintenance.

  • Safety and Security
  • Driving
  • Interior Features
  • Maintenance and care
  • Vehicle specifications

When and how to use the numerous features and functions of their vehicle will be explained in detail in the International Truck owners manual, written just for the main operator of this hard-working machine.

1998 International 4000 Factory Service Manual

The service manuals for the 1998 International 4000 vehicles are extensive and cover every vehicle operation and maintenance element:

  • Frame
  • Springs
  • Brakes
  • Steering
  • Exhaust
  • Electrical
  • Lubrication
  • Clutch
  • Rear Axle
  • Fuel Tanks

1998 International 4000 repair manuals are intended for use by technicians and dealerships that regularly maintain and repair the brand’s vehicles.