Western StarClass 7–8

Western Star 3800

Western Star's lighter-duty answer to city hauling and delivery.

Launched in 1988 as Western Star's lighter, city-focused line, the 3800 was the brand's entry into medium-duty delivery and vocational work, and remains one of the legacy series (alongside the 4800, 4900 and 6900) covered in Daimler's official Western Star heritage parts resources.

Maker
Daimler Truck North America
Years
1988–2003
Body
Medium-Duty
Rating
Up to 56,000 lb GVWR
Power
230–400 hp
Applications
City delivery, Regional haul, Vocational
Engines
Cummins M11Caterpillar 3126

Trouble with your 3800?

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Common replacement parts

Real products from the PartsNow catalog. Confirm fitment with Mike before ordering.

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

3030HNTRX

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

OTR10143

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

5-808330 - BRAKE KIT FOR 4709DEN SHOES

5-808330

5-808330 - BRAKE KIT FOR 4709DEN SHOES

370036A - OIL BATH SEAL

370036A

370036A - OIL BATH SEAL

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

348-4195

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

5008414PGBXW

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

11444 - GLADHAND BRACKET MOUNT

11444

11444 - GLADHAND BRACKET MOUNT

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

15W40 OIL

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

Brakes & Wheel EndAir SystemFiltrationElectrical & LightingSuspension & SteeringCooling SystemDrivetrainBody & CabExhaust
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Guides from the shop

All guides →
Electrical & Lighting

Trailer ABS Light Won't Go Off? Sensor & Wiring Guide

Trailer ABS light staying on? Step-by-step diagnosis for wheel speed sensors, harness corrosion, and ECU faults before you swap parts.
Aftertreatment & Emissions

DEF Lines Freezing? Winter Prevention & Fixes for Fleets

Stop DEF freezing from parking your trucks. Learn heated-line checks, tank insulation, and SCR fault codes before derates hit.
Trailer & Coupling

Fifth Wheel Not Locking? Diagnosis & Fix Before It Fails

Fifth wheel not locking or slipping under load? Step-by-step diagnosis, lube checks, jaw inspection, and rebuild-vs-replace guidance.

More Western Star models

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49X

The flagship severe-duty brute.

57X

Western Star goes premium on-highway.

47X

The vocational workhorse of the X-series.

4700

The accessible vocational Star.

4900

The classic hand-built Star.

5700XE

Western Star's aerodynamic experiment.

4800

The short-hood workhorse built for the dirtiest jobs in the yard.

6900XD

The heaviest-rated truck Western Star has ever built.

5800

Western Star's set-back-axle step toward the aerodynamic highway hauler.

5900

The big-bore Aero Tractor for drivers who wanted more cubes.