The Garage
Maintenance guides, buying advice, and industry insight for owner-operators and fleet managers who keep the heavy-duty world rolling.
FeaturedBuying Guides
Freightliner Cascadia Mirror Replacement Guide: Door vs Hood, Left vs Right
Ordering the wrong side or the wrong mirror type is the #1 cause of returns. Here's how to identify exactly which Cascadia mirror you need before you buy.
Ranked by real orders
The 100 Most Popular Semi Truck Parts
Not a listicle guess — the parts fleets and owner-operators actually order from us, ranked by units shipped. Live prices and stock, every part one click from checkout.
See the rankingPart-buying guides
Symptoms, selection and the job done right — for every part class we stock, with live prices and photos.
Buying GuidesAir Brake Chambers Explained: Types, Sizes, and When to Replace
Type 20, 24, 30 — what the numbers mean, how to read them off your old chamber, and the warning signs of a failing diaphragm every driver should know.
Fleet TipsOEM vs Aftermarket Semi Truck Parts: What Fleets Should Actually Compare
Dealer counter or aftermarket direct replacement? A practical framework — cost per mile, downtime, warranty and fitment risk — instead of brand loyalty.
Buying GuidesHow to Use Your VIN to Buy Guaranteed-Fit Semi Truck Parts
The 17-character VIN encodes your truck's exact build. Here's what each section means and how VIN-verified fitment kills wrong-part returns.
MaintenanceDPF & DOC Maintenance: Symptoms of a Clogging Filter and What It Costs to Ignore
Regens getting more frequent? Power down, fuel burn up? How the diesel particulate filter and oxidation catalyst fail, and when cleaning vs replacement makes sense.
Buying GuidesSemi Truck Headlight Replacement: Halogen vs LED and How to Order the Right Housing
Cracked lens, yellowed housing, or time for an LED upgrade? What to check before ordering a headlight for a Kenworth, Peterbilt, Volvo or Freightliner.
Fleet TipsPartStop in Tacoma: Same-Day Truck Parts for Repair Shops from Everett to Olympia
A real parts counter minutes from the Port of Tacoma — free local delivery, shelf stock you can pick up today, and B2B accounts for every repair shop on the I-5 corridor.
Buying GuidesPartStop Shipping Explained: Free ~3-Day Standard vs Paid Overnight
How our shipping works: free standard delivery on orders over $100 (typically about 3 business days), and next-business-day overnight from $50 depending on parcel size.
Buying GuidesFreightliner Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Freightliner trucks (Cascadia and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesKenworth Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Kenworth trucks (T680 and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesPeterbilt Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Peterbilt trucks (579 and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesVolvo Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Volvo trucks (VNL (300/400/670/760/860) and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesInternational Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for International trucks (LT and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesMack Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Mack trucks (Anthem and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Buying GuidesWestern Star Semi Truck Parts: Models We Cover and How to Order the Right Fit
Aftermarket direct-replacement parts for Western Star trucks (5700XE and more) — what we stock, how the model families differ, and how to verify fitment by VIN or cross-reference before you buy.
Fleet TipsSemi Truck Parts in Seattle: Same-Day from Our Tacoma Warehouse
Seattle fleets and repair shops don't need to wait on parcel carriers — PartStop's Tacoma store is 35 minutes down I-5, with free delivery across most of the metro and shelf stock you can pick up today.
MaintenanceCummins ISX15 / X15 EGR Hose Failure: Symptoms and Silicone Replacement (3687223)
A cracked EGR or charge-air hose on a Cummins ISX15 throws boost codes and kills fuel economy. Here's how to spot it and match a reinforced silicone direct replacement.
MaintenanceDetroit DD13 / DD15 Fuel Filter & Water Separator Guide (A4700903151, A0000905251)
Hard starts, power loss and a water-in-fuel light usually trace back to a neglected fuel filter or separator. How to match the right Detroit direct replacement.
MaintenanceDiesel Fuel/Water Separator: Symptoms, Change Interval and Cross-Reference (FS19765)
Water in diesel is a truck-killer. What a fuel/water separator does, when to change it, and how to match a direct replacement like FS19765 / P550851.
Buying GuidesFreightliner Cascadia Front Bumper Replacement: 2018+ vs Classic, Steel vs Chrome
The Cascadia bumper changed with the 2018 redesign — order the wrong generation and nothing lines up. How to identify and match your front bumper assembly.
Buying GuidesVolvo VNL Parts: Why the 2018 Facelift Changed the Bumper, Grille and Headlight Numbers
The 2018 VNL refresh changed most front-end part numbers. Order by the wrong generation and it won't fit — here's how to buy the right VNL parts the first time.
Buying GuidesSemi Truck Grille & Bug Screen Replacement: Cascadia, Kenworth T680, International LT
A cracked grille or missing bug screen isn't just cosmetic — it lets debris into the cooling stack. How to match a direct-replacement grille by model.
MaintenanceSemi Truck NOx Sensor: Derate Codes, Symptoms and Cross-Reference (Cascadia DD15, Cummins ISB)
A failed NOx sensor is the most common cause of an aftertreatment derate. How to read the symptoms and match the right upstream or downstream sensor.
MaintenanceSemi Truck Wheel Seal Replacement: Steer vs Drive Axle and How to Match by Size
A weeping wheel seal is an oil-soaked brake and a DOT flag waiting to happen. How to identify steer vs drive seals and match by dimension and SKF number.
Fleet TipsPort of Tacoma Drayage Parts: What Container Trucks Wear Out First
Drayage tractors working the Tacoma terminals live on stop-and-go, short-shift duty that eats specific wear parts. Here's what fails first — and why keeping those items on a local shelf beats a 4-day parcel.
MaintenancePacific Northwest Truck Prep: Parts for Puget Sound Rain and Cascade Pass Snow
Between eight months of rain and the snow over Snoqualmie and the Cascade passes, Northwest trucks get tested on visibility, traction and cold-weather systems. Here's what to check — and stock — before the wet season bites.
LogisticsWhy a Good Freight Forwarder Decides Whether Your Truck Parts Actually Sell
In semi-truck-parts sales, a part you cannot ship is a part you cannot sell. The freight forwarder moving your import containers quietly controls your shelf, your stock, and your revenue.
LogisticsFive Customers, Five Cities, One Trailer: Why FTL Consolidation Needs a Real Logistics Team
Combining five separate loads bound for five different cities into one coordinated move is not a spreadsheet trick. It takes a logistics partner with the planning muscle to make the math actually work.
LogisticsThe Right Air-Freight Partner Is the One Who Answers at 2 A.M.
Air freight is what you reach for when a critical part cannot wait. And when a flight gets rerouted or a carrier drops the ball, the partner who picks up the phone is worth more than any rate quote.
LogisticsWhen a Shipment Goes Missing or Arrives Broken, Who Actually Fixes It?
Lost boxes and damaged freight are not rare, they are routine. The difference between a shrug and a resolution is having a supply-chain partner who investigates, files the claim, and sees it through.
LogisticsContainer Drayage from the Ports of Seattle and Tacoma: How Long Road Keeps PartStop's Freight Moving
Drayage is the short move that makes or breaks an import. Here's how Long Road Transportation pulls PartStop's containers off the Puget Sound ports before the free time runs out.
LogisticsWhy the Cheapest Carrier Is Usually the Most Expensive: Quality Beats Price in Trucking
A rock-bottom rate feels like a win until the load is stranded and nobody's answering. Here's why choosing the best carrier saves you far more than a cheap quote ever will.
LogisticsWhen a Dry Van Won't Cut It: Moving Oversize Truck Parts on an RGN Lowboy Trailer
Some heavy-duty parts and equipment are too tall, too wide, or too heavy for a standard trailer. Here's how Long Road hauls oversize freight on an RGN and delivers it in one piece.
LogisticsBox-Truck Delivery Across Washington State: Final-Mile Freight Done by People Who Know the Region
Palletized freight, lift-gate drops, parts to shops and fleets — the final mile has its own demands. Here's how a Washington-based box-truck team gets it there right.
LogisticsWhy a Good 3PL Storage Warehouse Matters — and Why Long Road Warehouse Is a Strong Solution
A 3PL warehouse does far more than stack pallets. Here is what real fulfillment looks like, how the wrong warehouse quietly bleeds money, and why Long Road Warehouse is a strong fit.
LogisticsHow Long Road Warehouse Uses a WMS to Keep Inventory Under Control
A warehouse management system is the difference between real-time stock accuracy and constant oversells. Here is what a WMS actually does — and how it prevents lost inventory.
LogisticsSelling on Amazon, Walmart, Target and eBay at Once: How Long Road Warehouse Powers Multichannel Fulfillment
Juggling marketplaces by hand is how oversells and late shipments happen. Here is how one integrated 3PL lets PartStop sell across Amazon, Walmart, Target, eBay and more.
LogisticsWhy Importers Need a Strong Transloading Partner in Washington State
Transloading moves your ocean container onto domestic trailers before demurrage eats your margin. Here is why port-adjacent transloading in WA matters — and who needs it.
LogisticsHow Long Road Warehouse Became PartStop's Go-To Fulfillment Partner in Washington State
Shared PNW roots, near-perfect accuracy, same-day speed, and broad marketplace reach — the real reasons Long Road Warehouse became PartStop's trusted #1 fulfillment choice.
LogisticsBeating the Last Free Day: How Ad Hoc Logistics Drays PartStop Containers Out of Seattle and Tacoma
Every import container has a clock ticking on it the moment it's discharged. Here's how Ad Hoc's asset-based port drayage keeps PartStop's parts moving before demurrage and per-diem bite.
LogisticsWhy the Cheapest Drayage Quote Costs the Most: The Asset-Based Case for Choosing the Right Port Carrier
A broker with no equipment and no port plan looks like a bargain — until a chassis shortage, a missed terminal appointment, or a bonded-compliance slip turns the cheap quote into a demurrage bill.
LogisticsHeavy, Wide, and Overweight: How Ad Hoc Moves Oversize Freight and Transloads Heavy Container Cargo
Overweight containers, oversized heavy-duty components, and flatbed loads that need permits — here's how Ad Hoc transloads and hauls the freight that won't fit a standard dry van.
LogisticsThe Last Leg: How Ad Hoc Handles Box-Truck and Final-Mile Delivery Across Washington
Getting freight out of the terminal is half the job. Here's how Ad Hoc's box-truck fleet and final-mile service carry palletized, transloaded cargo the rest of the way to the door — same one team.
Fleet TipsWhy a Happy Customer Is Everything in Heavy-Duty Repair — and How Long Road Repair Earns It
In semi truck repair, a happy customer isn't a nice-to-have — it's the whole business. Here's what Long Road Repair in Tacoma does to earn trust one truck at a time.
Fleet TipsHow Long Road Repair Became a Go-To Heavy Duty Truck Repair Shop in Tacoma — and What It Means for PartStop
A leading Tacoma heavy-duty repair shop isn't built on luck. Here's the two-way synergy between Long Road Repair and PartStop that keeps trucks moving and parts priced sharp.
Fleet TipsHeavy Duty Truck Repair Across Washington: Every Service Long Road Repair Covers — and How Far It Reaches
From brakes and transmissions to mobile roadside rescue, Long Road Repair covers every heavy-duty service type across Tacoma and reaches the bigger cities within ~70 miles.
Fleet TipsBeyond Semi Trucks: Long Road Repair Services Heavy Equipment Too — and Why a Fitment Partner Like PartStop Is Essential
Tractors, forklifts, and heavy machinery all need parts — a huge, messy range of them. Here's why a multi-equipment shop like Long Road Repair leans on a VIN-and-part-number fitment partner like PartStop.