Class 8 parts, matched to your truck

How ordering works

Ordering is meant to be clear enough to do on a phone in the yard. Here are the five steps from finding a part to holding it in your hands.

1. Find the part number. Read the number on the part you are replacing, note the truck make, model, engine, and year, and photograph the old part from two angles.
2. Search or browse. Use the fitment lookup, the search page, or a department page to find the listing, then compare the part number, interchange numbers, and fitment table.
3. Choose a quantity. Add the part to your cart, or pay immediately for a single item with the PayPal button on its product page.
4. Approve shipping. We email a freight or parcel quote for your address and confirm any sales tax. The carrier is booked only after you approve.
5. Receive and inspect. Check the box and the part against your order. If there is damage, make a note on the carrier paperwork and email us. If the part is wrong, start a return within 30 days.

Ready to pay for a quote or a single item? You can open PayPal in a new tab and settle the amount we confirmed by email.

Shop by repair job

Sometimes you know the job and not the part. These common repairs show which listings usually belong together, so you can build one order instead of three.

• Brake job on a drive axle: brake shoe kit 4707Q, wheel seal 370001BC4, and a Haldex automatic slack adjuster, then measure stroke using the pushrod guide.
• Wet air system: a Bendix AD-IS cartridge or the AD-9 cartridge, plus glad hand pair, following the air dryer guide.
• Preventive maintenance on a Cummins X15: LF9009 lube filter, FS1022 separator, and WF2071 coolant filter.
• Rough ride or leaning trailer-side frame: a Firestone air spring or a Goodyear air spring, and a look at the shocks.
• Overheating in traffic: the Horton fan clutch and a Gates Micro-V belt.
• Pre-trip failures: LED marker lamps, a wiper blade, and a 7-way trailer socket.

Add the items to one cart, and we will quote shipping for the whole order. Heavy and light parts may ship separately, but you approve one quote.

Brands you will see in the catalog

The catalog lists parts under the manufacturer's own brand and part number. You will see air brake and safety systems from Bendix and Haldex, foundation brake parts from Meritor, filtration from Fleetguard, Donaldson, and Baldwin, drivetrain parts from Eaton, Gates, Stemco, and SKF, suspension from Firestone and Dayton Parts, lighting from Grote and Truck-Lite, and starting, cooling, and cab parts from Delco Remy, Horton, Phillips, and Trico.

These companies own their names and trademarks. We list them only to show what the part is and which trucks it fits, and A-One Truck Auto is not affiliated with them. If a part you need is not in the catalog yet, write to support@aonetruckauto.com and we will tell you whether we can source it and what we would charge.

Fleet accounts

Maintenance managers and owner-operators with several trucks can ask for a fleet account. We do not publish customer names or logos, and we do not claim any, because the point of an account is to make your own ordering simpler.

A fleet account can mean a standing parts sheet with the SKUs you buy most often, purchase order ordering, consolidated invoices, and quote requests for quantities. Terms are approved case by case. Prices on this site are retail prices in U.S. dollars, and quantity pricing is quoted individually.

To start, write to support@aonetruckauto.com with your company name, the make and model years of your trucks, the parts you replace most often, and the delivery locations you use. We reply by email with a short list of the items we recommend and the next steps.

What you pay and who you pay

You pay A-One Truck Auto for the parts you order, at the price shown in U.S. dollars on the product page, through PayPal. We earn our margin on that price. We are not an affiliate site and we do not collect referral fees from the brands listed.

Sales tax is added where required, and shipping is quoted separately and approved by you before the carrier is booked. Nothing is charged to a card on this site, and no payment is final until PayPal reports it as completed. Our Terms of Sale and Privacy Policy describe the rest.

What this catalog is built for

Owner-operators and fleet shops that run Class 8 highway tractors need parts with clear part numbers, published fitment rows, and a price they can approve before freight is booked. This home page points you to the eight departments we stock, all forty catalog parts with product cards, and the three technical guides that answer the questions we hear most often at the parts desk.

Each product page shows the brand, the stamped part number, interchange numbers when we have them, a make-model-year-engine table, the USD price for the part itself, and how the part usually ships. PayPal collects only that listed part total for the quantity you choose. Shipping is quoted by email and approved before a carrier is booked. Sales tax, when it applies to your ship-to address, is also confirmed before the order moves.

We do not publish a telephone number. Email support@aonetruckauto.com with the VIN, the engine serial when you have it, and a clear photo of the old part stamp when fitment is unclear. That is faster than guessing from a model name alone, especially on Cascadia, 579, T680, VNL, Pinnacle, and Anthem trucks that share engines across model years.

Browse by department when you know the system you are repairing, use the fitment lookup when you know the truck, or open the catalog when you already have a part number. The guides cover pushrod stroke measurement, filter interval planning, and air dryer cartridge service so you can decide what to order before you open a cart.

Part numbers and prices on product pages are the source of truth for checkout. All forty product cards on this page match the catalog and sitemap; each card links to its product page with matching image, name, and price. Department tiles show current stocked counts that match the catalog data file.

Frequently asked questions

More answers are on the FAQ page and in the guides. If you cannot find what you need, write to support@aonetruckauto.com.