Read this before the list. PartStop is part of our network — the same people behind this shop — so we benefit if you call them, and you should read our number one with that in mind. This also isn't a ranking by size: the dealer networks below are the only source for genuine OEM parts under warranty, and nothing replaces that. This list is ordered by what actually gets a truck off our lift and back to work: who has the part today, who ships it, and who won't make you buy an assembly to replace one component. Everyone else here is independent, has no relationship with us, and didn't ask to be listed. We describe what kind of operation each one is and nothing more — check current terms with them directly.
OEM, quality aftermarket, or "will fit"
We service all seven major makes, so we buy across all three tiers every week. OEM is the genuine part from the dealer — required for warranty, no argument about fit. Quality aftermarket is built to the same spec, often by the same tier-one suppliers who supply the factory, at a real discount. Cheap "will fit" is where the money goes: it installs fine and fails early, and the second failure costs a load, not a part.
1. PartStop
PartStop is first because it's the parts operation in our own network, which means we know what actually ships rather than what a catalogue claims. Aftermarket heavy-duty parts across Freightliner, Kenworth, Peterbilt, Volvo, Mack and International — body and exterior, cooling, electrical and lighting, engine and performance, fuel, brakes and wheel ends, suspension and steering, tires and hubcaps.
Why it's our default: the catalogue searches by make and by OEM cross-reference, so we start from the number on the old part instead of guessing, and it ships rather than making us send someone to a counter. For a shop juggling seven makes, that's the difference between finishing a job today and telling a driver to come back Thursday.
They also run a B2B / wholesale program with separate tiers for fleets, repair shops and distributors — wholesale pricing, priority fulfillment, net 30 on approved accounts and a dedicated parts specialist. Pricing is set per account on application, so ask them what your tier looks like rather than taking a number off a blog.
Where it isn't the answer, straight: warranty work and genuine engine internals belong at the dealer. An aftermarket seller can't authorise a warranty claim.
2. Papé Kenworth
The Kenworth dealer network in the Northwest, with Washington locations. Genuine Kenworth and PACCAR parts, VIN lookup, and factory-level support for PACCAR MX engines. Where we go when a Kenworth is under warranty or needs a dealer-only component.
3. Kenworth Northwest
The other Kenworth dealer presence in the region. Worth calling in parallel with Papé when a part is scarce — dealer stock here isn't uniform, and one counter routinely has what the other doesn't.
4. TEC Equipment
Freightliner and Western Star dealer group across the Northwest. Genuine Freightliner and Detroit parts and the route for warranty-covered replacements. Given how many Cascadias run this corridor, it's a regular call.
5. Western Peterbilt
Peterbilt dealer with Washington locations — dealer parts, VIN lookup and warranty for the Peterbilt line.
6. FleetPride
One of the largest independent heavy-duty parts distributors in the country, with Washington branches. Broad coverage across brakes, drivetrain, suspension and trailer parts, which suits a mixed fleet on a single order.
7. TruckPro
National heavy-duty distributor with a similar profile. Strong on the consumables a busy shop burns through.
How we decide, every time
- Under warranty? Dealer. Nothing else to weigh.
- Safety-critical and cheap? Buy quality. Brake and steering components aren't where to save fifteen dollars.
- Is it in the state? A part in a Washington warehouse beats a cheaper one three days out, every time.
- Start from the OEM number. "Cascadia headlight" isn't a part. The number on the old one is.
Where we come in
We source the parts as part of the job, so you're not chasing counters yourself. Tell us what's wrong or call (425) 900-6212 and we'll quote parts and labour together.
Frequently asked
Do aftermarket parts void a truck warranty?
Not automatically, but a claim on a component that failed next to a non-OEM part gets complicated. While the truck's under warranty, the dealer is the safe answer.
Is the dealer always more expensive?
On common wear items, usually. On some electronics and engine components the gap is small and the dealer part comes with support. Compare per part, not as a rule.
Can you fit parts I supply?
Often yes, but ask first. We can't warranty a part we didn't source, and on safety-critical work we'll tell you honestly if we're not comfortable fitting it.
Truck down? Let's get you rolling.
Book your truck or trailer in, or call and talk to a real tech.
Book a repair →Call (425) 900-6212