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Peterbilt 378

PeterbiltClass 8

378

The set-back-axle workhorse for heavy vocational duty.

The 378 was the 'little brother' of the 379, using a fiberglass hood and a shorter 119-inch BBC that made it a favorite for dump, mixer, and heavy vocational fleets through 2007.

Built by

PACCAR

Production

1986–2007

Body type

Vocational

Rating

Up to 80,000 lb GCWR

Power

350–550 hp

Typical jobs

Construction, Dump, Regional-haul

Engine options

Caterpillar C15Cummins ISXDetroit Series 60

Common parts that fit

Common replacement parts for this class of truck. Confirm exact fitment for your engine and config 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 End Air System Filtration Electrical & Lighting Suspension & Steering Cooling System Drivetrain Body & Cab Exhaust

Find parts that fit

More Peterbilt models

579

The aerodynamic flagship of the fleet world.

589

The modern heir to the legendary 389.

389

The chrome king. The owner-operator icon.

379

The legend that started the long-hood cult.

567

Built to take a beating on the job site.

520

Low-entry cabover purpose-built for trash routes.

537 / 536

Peterbilt style, medium-duty practicality.

365 / 367

Set-forward / set-back vocational siblings.

220 EV

Cabover electric for quiet city routes.

359

The original long-hood legend that built the Peterbilt mystique.

377

The aero-sloped conventional that bridged classic and modern Peterbilt.

362

Peterbilt's last great cabover, aerodynamic and unmistakable.

387

Peterbilt's full-aero long-haul cruiser of the 2000s.

386

The aero hood on the traditional Peterbilt cab.

384

The short-BBC aero conventional for tight, weight-sensitive runs.

587

The wide-cab aero flagship that paved the way for the 579.

320

The low-cab-forward refuse king that ruled the route for three decades.

548

Class 8 muscle in a medium-duty cab for the toughest upfits.

535

The right-sized non-CDL Class 5/6 workhorse for the daily grind.

325

Peterbilt's nimble non-CDL Class 5 city-work truck.

330

Peterbilt's first medium-duty conventional, built to adapt to anything.

335

The medium-duty conventional that borrowed big-rig style.

337

The dependable Class 6/7 workhorse configured your way.

348

The Class 7-to-8 medium-duty bruiser for heavy upfits.

220

The compact low-cab-forward built for tight city streets.

579EV

Zero-emission Class 8 hauling with the 579's proven aero shape.

536EV / 537EV / 548EV

Peterbilt's next-generation zero-emission medium-duty service fleet.

AI-powered truck and trailer agentic commerce platform. 50,000+ parts from trusted dealers.

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