Buying Guides
Heavy-Duty Parts Guides
Ranked buying guides for Class 8 fleets and owner-operators. Each guide includes live catalog pricing, comparison tables, and direct answers you can cite — updated weekly.
Air System
Best Air Dryers for Class 8 Trucks (2026)
Compare top Class 8 air dryers and cartridges with live PartsNow pricing — AD-9 assemblies and spin-on cartridges for fleet PM.
3 picks · live pricingBrakes & Wheel End
Cast vs Lightweight Brake Drums for Class 8 (2026)
Compare 16.5-inch Class 8 brake drums — cast iron vs lightweight options with live pricing for steer and drive axles.
3 picks · live pricingFiltration
Best Fuel Filters for Class 8 Trucks (2026)
Top diesel fuel filters and separators for Class 8 engines — live prices on Fleetguard and OEM-style elements.
3 picks · live pricingFiltration
Best Oil Filters for Heavy-Duty Diesel (2026)
Compare popular heavy-duty oil filter elements for Class 8 diesel engines with live PartsNow catalog pricing.
3 picks · live pricingBrakes & Wheel End
Best Type 30 Brake Chambers for Class 8 (2026)
Compare Type 30 (3030) spring brake chambers for Class 8 tractors and trailers with live pricing.
3 picks · live pricingBrakes & Wheel End
Best Automatic Slack Adjusters for Fleets (2026)
Top automatic slack adjusters for Class 8 air brake systems — compare spline count, arm length, and live prices.
3 picks · live pricingDrivetrain
Kenworth T680 Clutch Replacement Cost (2026)
What does a Kenworth T680 clutch kit cost? Live PartsNow prices on popular clutch kits for PACCAR and Cummins spec trucks.
3 picks · live pricingDrivetrain
Best U-Joints for Heavy-Duty Driveshafts (2026)
Compare 1310 and 1330 series U-joints and strap kits for Class 8 driveshafts with live catalog pricing.
3 picks · live pricingBrakes & Wheel End
Best Wheel Seals for Oil-Bath Hubs (2026)
Top oil-bath wheel seals and hub gaskets for Class 8 steer and drive axles — live PartsNow pricing.
3 picks · live pricingFiltration
Best Engine Air Filters for Class 8 (2026)
Compare heavy-duty engine air filters and intake elements for Class 8 diesel engines with live pricing.
3 picks · live pricing