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Used Peterbilt 378 Truck Parts For Sale

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Air Intake & Filtration (49)   Air Cleaners / Air Filter Housings (21)   Air Transfer Tubes (28)Air Tanks (19)Axles & Differentials (41)   Axle Assemblies, Front (39)   Spindles / Knuckles (2)Battery Box Covers (2)Battery Boxes / Trays (20)Brakes (8)   ABS Control Modules (4)   Air Dryers (3)   Brake Parts (1)Cab Mounts (5)Cab, Body & Interior (293)   Back Windows (1)   Brake / Clutch / Gas Pedal Parts (1)   Bumpers, Front (12)   Cabs (32)   Dashboards (16)   Door Assemblies, Front (23)   Door Mirrors (23)   Door Vent Glass (1)   Door Window Regulators (2)   Door Windows (1)   Doors (44)   Fender Extensions (3)   Fenders (4)   Grille Guards (3)   Grilles (3)   Hood Hinges (2)   Hoods (32)   Interior Misc. Parts (21)   Mirrors (5)   Roof Fairings (1)   Seats (9)   Side View Mirrors (16)   Sleeper Doors (12)   Sleepers (6)   Steering Wheels (3)   Sun Visors (Exterior) (1)   Sun Visors (16)Cooling & HVAC (76)   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 (14)   Intercoolers & Charge Air Coolers (10)   Intercoolers (1)   Radiator Frames (1)   Radiator Overflow Bottles / Surge Tanks (8)   Radiators (28)Dashboard Switches (2)Electrical & Lighting (45)   Body / Chassis Control Modules (1)   Cab Wiring Harnesses (2)   Door Electrical Switches (2)   Fuse Boxes & Panels (9)   Gauges (5)   Headlight Assemblies (7)   Radios (4)   Side Marker Lamps (1)   Throttle Position Sensors (4)   Windshield Washer Reservoirs (4)   Windshield Wiper Arms (2)   Windshield Wiper Motors (4)Electrical Misc. Parts (1)Engine & Powertrain (10)   Breathers (5)   Engine Mounts (5)Exhaust & Emissions (16)   Diesel Exhaust Fluid (DEF) Tanks (1)   Exhaust Assemblies (5)   Exhaust Brackets (8)   Exhaust Pipes (2)   Exhaust Parts (4)Exterior Misc. Parts (14)Frame & Chassis (36)   Brackets, Misc. (8)   Crossmembers (11)   Deck Plates / Catwalk (4)   Frame Horns (12)   Headache Racks (1)Fuel System (54)   Fuel / Water Separators (1)   Fuel Tank Straps & Brackets (15)   Fuel Tanks (Truck) (38)Hood Parts (8)Hydraulics & PTO (4)   Hydraulic Tanks (4)Instrument Panel Clusters (33)Miscellaneous Truck Parts (4)Power Steering Reservoirs (2)Suspension & Steering (62)   Leaf Springs, Front (12)   Leaf Springs, Rear (1)   Power Steering Assemblies (1)   Spring Hangers (3)   Steering Columns (21)   Steering Gears / Racks (2)   Steering Pumps (1)   Steering Shafts (1)   Suspension Crossmembers / K-Frames (6)   Suspension Misc. Parts (7)   Suspensions (7)Tool Boxes (13)Transmission & Driveline (9)   Driveshaft Parts (2)   Driveshafts (7)Truck Bodies / Boxes / Beds (1)Wheels, Tires & Hubs (6)   Mud Flap Hangers (2)   Tires & Rims (4)
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Peterbilt (837)
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378 (837)
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Showing 1 - 25 of 837 Listings

1 - 25 of 837 listings
1 - 25 of 837 listings
Peterbilt 378 Front Axle Assembly

1996 Peterbilt 378 Front Axle Assembly

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(Used) 1996 Peterbilt 378, FRONT AXLE BEAM- Part Number: 813955, Serial Number: H-95-07-35517, Center Leaf to Center Leaf: 34", Make: Eaton, Model: 12F4, Capacity: 12,000 Lbs, For more...
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)1996
Capacity12,000 Lbs
Part Number813955
Stock NumberP-112333
MLS Number14730793
CategoryAxle Assemblies, Front
Last Updated11/6/2026
Location
Elkton, MD, US
Sold By
CRG Heavy Truck Parts
(844) 402-___  SHOW
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CRG Heavy Truck Parts
Peterbilt 378 Breather

2004 Peterbilt 378 Breather

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2004 Peterbilt 378 Air Breather For Sale - LH / Driver Side - Used - May have some cosmetic blemishes (see photos). Give us a shout by phone, email, or text. We ship everywhere.
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)2004
Stock NumberPT-0653-42
MLS Number14729070
CategoryBreathers
Last Updated11/6/2026
Location
York, ON, Canada
Sold By
Lomoca Inc.
(833) 835-___  SHOW
NUMBERCall Seller
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Lomoca Inc.
Peterbilt 378 Breather

2004 Peterbilt 378 Breather

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2004 Peterbilt 378 13" Air Breather Mounts For Sale - LH/Driver-Side - Used - May have some cosmetic blemishes (see photos). Give us a shout by phone, email, or text. We ship everywhere.
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)2004
Stock NumberPT-0653-19
MLS Number14729047
CategoryBreathers
Last Updated11/6/2026
Location
York, ON, Canada
Sold By
Lomoca Inc.
(833) 835-___  SHOW
NUMBERCall Seller
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Lomoca Inc.
Peterbilt 378 Breather

2005 Peterbilt 378 Breather

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2005 Peterbilt 378 Air Breather For Sale - LH / Driver Side - Used - May have some cosmetic blemishes (see photos). Give us a shout by phone, email, or text. We ship everywhere.
ConditionUsed
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)2005
Stock NumberPT-0625-13
MLS Number14729041
CategoryBreathers
Last Updated11/6/2026
Location
York, ON, Canada
Sold By
Lomoca Inc.
(833) 835-___  SHOW
NUMBERCall Seller
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Lomoca Inc.
Peterbilt 378 Radiator

2005 Peterbilt 378 Radiator

$895 USD
GOOD USED TAKEOUT/ PRESSURE CHECKED RADIATOR ASSEMBLY/ NO RADIATOR CAP/ FIREWALL MOUNTED RESERVOIR, Engine Make: Caterpillar, Engine Model: C15, With Frame: true
ConditionUsed
Engine ModelCaterpillar C15
Fits To Make(s)Peterbilt
Fits To Model(s)378
Will Fit Year(s)2005
Part Number239298
Stock Number60224-7
MLS Number12918614
CategoryRadiators
Last Updated10/24/2026
Location
Ucon, ID, US
Sold By
Holst Truck Parts
(833) 541-___  SHOW
NUMBERCall Seller
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Holst Truck Parts
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