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Peterbilt 378 Truck Parts For Sale

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Air Intake & Filtration (44)   Air Cleaners / Air Filter Housings (23)   Air Transfer Tubes (21)Air Tanks (20)Axles & Differentials (45)   Axle Assemblies, Front (42)   Spindles / Knuckles (3)Battery Box Covers (2)Battery Boxes / Trays (21)Brakes (5)   ABS Control Modules (1)   Air Dryers (3)   Brake Parts (1)Cab Mounts (5)Cab, Body & Interior (289)   Back Windows (1)   Bumpers, Front (16)   Cabs (32)   Dashboards (14)   Door Assemblies, Front (23)   Door Mirrors (22)   Door Vent Glass (1)   Door Window Regulators (2)   Door Windows (1)   Doors (44)   Fender Extensions (6)   Fenders (4)   Grilles (3)   Hood Hinges (2)   Hoods (32)   Interior Misc. Parts (21)   Mirrors (5)   Roof Fairings (1)   Seats (9)   Side View Mirrors (16)   Sleeper Doors (6)   Sleepers (8)   Steering Wheels (3)   Sun Visors (Exterior) (1)   Sun Visors (16)Cooling & HVAC (77)   A/C Compressors (1)   A/C Condensers (3)   Blower Motors (HVAC) (2)   Cooling Assemblies (Rad., Cond., ATAAC) (6)   Fan Blades (1)   Fan Clutches (1)   Heater / AC Climate Control Parts (12)   Intercoolers & Charge Air Coolers (10)   Intercoolers (1)   Radiator Frames (1)   Radiator Overflow Bottles / Surge Tanks (8)   Radiators (31)Electrical & Lighting (41)   Body / Chassis Control Modules (1)   Cab Wiring Harnesses (1)   Door Electrical Switches (1)   Fuse Boxes & Panels (6)   Gauges (4)   Headlight Assemblies (10)   Radios (4)   Side Marker Lamps (1)   Throttle Position Sensors (4)   Windshield Washer Reservoirs (4)   Windshield Wiper Arms (2)   Windshield Wiper Motors (3)Electrical Misc. Parts (1)Engine & Powertrain (4)   Engine Mounts (4)Exhaust & Emissions (18)   Exhaust Assemblies (4)   Exhaust Brackets (12)   Exhaust Pipes (2)   Exhaust Parts (4)Exterior Misc. Parts (14)Frame & Chassis (35)   Brackets, Misc. (8)   Crossmembers (10)   Deck Plates / Catwalk (2)   Fifth Wheels (1)   Frame Horns (13)   Frames (1)Fuel System (54)   Fuel / Water Separators (1)   Fuel Tank Straps & Brackets (15)   Fuel Tanks (Truck) (38)Hood Parts (9)Hydraulics & PTO (3)   Hydraulic Tanks (3)Instrument Panel Clusters (32)Miscellaneous Truck Parts (4)Power Steering Reservoirs (2)Suspension & Steering (62)   Leaf Springs, Front (12)   Power Steering Assemblies (1)   Spring Hangers (1)   Steering Columns (22)   Steering Gears / Racks (4)   Steering Pumps (1)   Steering Shafts (1)   Suspension Crossmembers / K-Frames (6)   Suspension Misc. Parts (8)   Suspensions (6)Tool Boxes (11)Transmission & Driveline (9)   Driveshaft Parts (2)   Driveshafts (7)Truck Bodies / Boxes / Beds (1)Wheels, Tires & Hubs (1)   Mud Flap Hangers (1)
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Peterbilt (813)
Model
378 (813)
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Showing 1 - 25 of 813 Listings

1 - 25 of 813 listings
1 - 25 of 813 listings
Peterbilt 378 Front Axle Assembly

1993 Peterbilt 378 Front Axle Assembly

Newly Listed
$3,500 USD
GOOD USED COMPLETE 20K FRONT AXLE ASSY. COMES WITH SPRINGS AND STEERING BOX, Capacity: 20K, Hub Bolts: 10/BUDD, Brake Type: DRUM, Axle Make: SPICER
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)1993
Capacity20K
Stock Number41226-6
MLS Number14330541
CategoryAxle Assemblies, Front
Last Updated4/24/2026
Location
Ucon, ID, US
Sold By
Holst Truck Parts
(833) 541-___  SHOW
NUMBERCall Seller
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Holst Truck Parts
Peterbilt 378 Cooling Assembly

1995 Peterbilt 378 Cooling Assembly

$1,270 USD
(USED) Peterbilt 378 Rad#: N/A ATA#: 05-18731 Condenser#: N/A Engine: CUMMINS N14 CELECT+ Ref# N/A COOLING ASSEMBLY, INCLUDES RADIATOR, CHARGE AIR COOLER, AC CONDENSER, INCLUDES OVERFLOW...
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Part NumberN/A
Stock Number25737955
MLS Number13312612
CategoryCooling Assemblies (Rad., Cond., ATAAC)
Last Updated4/17/2026
Location
Sioux Falls, SD, US
Sold By
Vander Haag's Inc.
(855) 370-___  SHOW
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Vander Haag's Inc.
Peterbilt 378 Fifth Wheel

1988 Peterbilt 378 Fifth Wheel

$400 USD
Holland FW35 Air Slide Fifth Wheel, 33.5" Frame Width, 86.5" Rail, 52.5" Slide Base, 24" Slide Travel, 6.75" Deck Height, Driver Side Release. Top Plate P/N XA-351-A-L-P, S/N A00002539H
ConditionUsed
Fits To Make(s)PETERBILT
Fits To Model(s)378
Stock Number1511-12
MLS Number13893134
CategoryFifth Wheels
Last Updated4/9/2026
Location
Fresno, CA, US
Sold By
Garabedian Equipment
(855) 794-___  SHOW
NUMBERCall Seller
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Garabedian Equipment
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