Parts for the Peterbilt 378
Common wear and maintenance parts for the Peterbilt 378 (Class 8, Vocational). Browse brakes, air system, filtration, and other categories matched to this truck type. SKUs and prices are from our live catalog — confirm exact fitment with Mike before ordering.
Tools & Supplies
13 verified·0 parts in catalog
Service interval
Varies by duty cycle
Catalog range
Quote
Suspension & Steering
5 verified·6 parts in catalog
Service interval
Every 100k–150k miles
Catalog range
$106.78–$303.40
Filtration
2 verified·12 parts in catalog
Service interval
Every 15k–25k miles with oil change
Catalog range
$8.25–$301.20
Electrical & Lighting
2 verified·6 parts in catalog
Service interval
Replace when dim or damaged
Catalog range
$7.02–$149.44
Brakes & Wheel End
1 verified·15 parts in catalog
Service interval
Inspect every 90 days; replace every 3–5 years
Catalog range
$2.41–$244.75
Cooling System
1 verified·3 parts in catalog
Service interval
Hoses/caps at cooling system service
Catalog range
$6.12–$30.73
Air System
No verified-fit data yet · 6 parts in catalog
Service interval
Cartridge every 12 months or 100k miles
Catalog range
$12.38–$1577.18
Drivetrain
No verified-fit data yet · 3 parts in catalog
Service interval
Inspect every 50k miles; replace when loose
Catalog range
$8.37–$50.88
Body & Cab
No verified-fit data yet · 6 parts in catalog
Service interval
Replace when torn or missing
Catalog range
$5.47–$24.81
Exhaust
No verified-fit data yet · 3 parts in catalog
Service interval
Ash service per OEM interval; sensors as needed
Catalog range
$112.79–$154.28
Not sure it fits your 378?
Verified-fit parts are matched to published fitment data. For everything else — engine, axle spec, model year — confirm with Mike before ordering.