Best Shipping, LTL Freight and 3PL Options for Auto Parts Sellers
A bumper, a tonneau cover and a cat-back exhaust can all sit in one cart, and none of them ships like a box of brake pads. This guide covers the freight carriers, parcel carriers, shipping software and fulfillment options parts sellers use, with who each one fits and where each one falls short.
Shipping is where many parts orders make or lose their margin. A parcel rate for a gasket set is easy to get right. A 70 inch bed cover box or a palletized rear bumper is not, and a store that answers every order with one flat number either eats the difference or scares off the buyer.
Disclosure: Web Shop Manager is an eCommerce platform for parts sellers, and it does not sell shipping. Every company in entries 1 to 8 is a Web Shop Manager integration partner, and our partners are listed first. We have included honest drawbacks for partners too. Facts about each company come from its own website and from our partner pages, checked in October 2026. Rates, limits and plans change, so confirm them with the carrier or vendor before you build pricing around them.
Dimensional weight: why a light bed cover ships heavy
Parcel carriers charge for the space a box takes up, not only what it weighs. They multiply length by width by height in inches and divide by a published divisor. If that dimensional weight is higher than the scale weight, you pay for the dimensional weight.
- UPS and FedEx use a divisor of 139 for most US commercial shipments. UPS lists 166 for its retail rates.
- USPS applies dimensional weight to packages larger than one cubic foot (1,728 cubic inches), using a divisor of 166.
Take a folding tonneau cover in a 72 by 20 by 8 inch box that weighs 45 pounds. The box is 11,520 cubic inches. Divided by 139, it bills as 83 pounds with UPS or FedEx, nearly twice its real weight. Long, light parts such as bed covers, running boards, light bars and exhaust tubing are where dimensional weight hurts most, so store your real box dimensions on every product. A rate quote built from the part’s dimensions instead of the shipping box will come in low.
LTL freight or parcel: where the line falls
Parcel carriers have hard limits. UPS and FedEx Ground accept packages up to 150 pounds, 108 inches long and 165 inches in length plus girth (girth is twice the width plus twice the height). USPS Ground Advantage stops at 70 pounds and 130 inches in length plus girth. A part over those limits has to ship as freight.
LTL (less than truckload) freight moves palletized or crated shipments that share a trailer with other shippers’ freight. It usually makes sense for:
- Parts over the parcel weight or size limits: front and rear bumpers, hard bed covers, transmissions, axles, complete exhaust systems in long crates.
- Multi-box orders that would cost more as several large parcels than as one pallet, such as a lift kit with shocks and springs.
- Dealer and shop orders that ship on a pallet to a commercial address with a loading dock.
LTL is priced on weight, distance and freight class. In July 2025 the National Motor Freight Classification moved many commodities to density-based classes, so the pallet’s real dimensions and weight now drive the class more often than the commodity name. Wrong dimensions on the bill of lading can lead to a reclassification charge after delivery. Delivery to a home usually adds accessorial charges, such as residential delivery and a liftgate when there is no dock.
Freight quotes at checkout
Most parts stores handle freight in one of four ways:
- A flat freight charge. Simple, but it overcharges nearby commercial buyers and undercharges rural residential ones.
- Free shipping over a threshold. Works on light parts and quietly loses money on a 110 pound bumper.
- “Call for a freight quote.” Honest, but many shoppers leave rather than wait.
- A live freight quote at checkout. The store sends the cart’s weight, dimensions or freight class and the shopper’s address to the carrier or freight marketplace and shows a real price before the order is placed.
A live quote is the only one of the four that prices the real shipment while the shopper is deciding. To make it work, every heavy product needs accurate shipping weight and box or pallet dimensions, a freight class where your carrier uses one, and a question at checkout about residential delivery and liftgate service. It also needs a sensible fallback: if the freight service is slow or down, the checkout should still offer the shopper a way to buy.
Nine shipping, freight and 3PL options for auto parts sellers
Freight comes first because oversized parts are where shipping goes wrong most often. Our partners are listed first, then a third-party logistics (3PL) option that is not a partner.
1. Freightcom
Freightcom is a shipping platform based in Bolton, Ontario. It describes itself as a shipping solution for small and medium-sized businesses in Canada, covering parcel, domestic and cross-border LTL freight, and spot quotes for partial and full truckload shipments. One account gives you access to many couriers and freight carriers, including Canada Post, Purolator, UPS, FedEx, Day and Ross, Manitoulin, XPO, Saia and TForce Freight.
On Web Shop Manager 6.0, the Freightcom application for Web Shop Manager quotes freight inside the checkout itself, against your own Freightcom account and negotiated rates, while the shopper is still on the page. You choose which carrier services the store may quote. The rate call runs under a four second limit, so a slow or unavailable carrier drops its options instead of stalling the checkout.
Who it fits: parts sellers shipping heavy and oversized parts within Canada or across the US and Canada border, who want several carriers quoted at once.
Where it falls short: Freightcom is built around Canadian shippers, so a US-only store should confirm coverage and pricing on its own lanes first. Freightcom does not publish a rate table, so you only see your prices once you have an account. The checkout application is available on Web Shop Manager 6.0 stores.
2. TForce Freight
TForce Freight is a less-than-truckload carrier, formerly UPS Freight, and part of TFI International. Its site lists LTL service across the US and to Canada, Mexico, Alaska, Hawaii, Puerto Rico and Guam, plus truckload service.
The TForce Freight integration with Web Shop Manager returns LTL quotes at checkout based on freight class, weight and destination, generates the bill of lading, supports accessorial services such as liftgate and residential delivery, and tracks the shipment. It is built for the bumpers, lift kits, wheels and other oversized items that do not fit parcel rules.
Who it fits: US parts sellers who ship pallets and crates regularly and want one direct LTL carrier relationship.
Where it falls short: it is one carrier, so the shopper sees one carrier’s price rather than a comparison. LTL quotes are only as good as your freight class and dimensions, and residential and liftgate charges can make a home delivery cost far more than the same pallet to a shop.
3. ParcelPath
ParcelPath sells discounted UPS and USPS labels and advertises savings of 60 to 89 percent off UPS and USPS shipping, with no monthly fee, subscription or minimum. Its PalletPath service gives access to 22 national LTL carriers with automatically generated bills of lading.
The ParcelPath integration with Web Shop Manager covers discounted UPS and USPS labels, LTL freight options, mobile barcode shipping without a printer, and label printing and tracking from one dashboard.
Who it fits: smaller and mid-size parts sellers who ship mostly parcels and want lower UPS and USPS label costs without a software subscription.
Where it falls short: it covers UPS and USPS, not FedEx. The headline savings are a range: ParcelPath’s own sample rates for a 10 pound package show smaller discounts than the headline, so price your real boxes before you count on a number.
4. ShipStation
ShipStation is web-based shipping and order management software. It imports orders from many sales channels, prints labels for UPS, USPS, FedEx, DHL and other carriers, and supports automation rules, batch label printing, branded tracking and customs forms. Its pricing page lists a 30 day free trial, with plans priced by monthly shipment volume starting at $14.99 a month for 50 shipments on the Starter plan.
The ShipStation integration with Web Shop Manager brings store orders into ShipStation for labels, tracking and fulfillment rules.
Who it fits: parts sellers who also sell on Amazon or eBay and want every channel’s orders shipped from one screen.
Where it falls short: the monthly price climbs with shipment volume, and the Standard and Premium plans cost more than Starter at every volume. ShipStation works after the order is placed. It does not decide the freight price the shopper sees at checkout.
5. ShipWorks
ShipWorks is multi-carrier shipping software for higher-volume fulfillment. Its pricing page describes it as Windows-installed software with a locally installed database, with plans starting at $189 a month for up to 5,000 shipments and warehouse plans above that. It supports rate comparison and labels across UPS, FedEx, USPS and DHL, rules-based order routing, batch printing and ERP and WMS connections.
The ShipWorks integration with Web Shop Manager sends store orders into ShipWorks for rules-based fulfillment.
Who it fits: parts warehouses shipping thousands of orders a month that want routing rules and a desktop workstation at the pack bench.
Where it falls short: it needs Windows machines and a local database to maintain, and the entry price is well above ShipStation’s. Like ShipStation, it handles labels after the sale, not the checkout price.
6. UPS
UPS ships packages up to 150 pounds, 108 inches long and 165 inches in length plus girth, and uses a dimensional weight divisor of 139 on daily rates. The UPS integration with Web Shop Manager shows real-time UPS rates at checkout based on package size, destination and service, and covers label creation, tracking and returns labels.
Who it fits: most parts sellers, for everyday parcels from sensors to wheels and tires.
Where it falls short: long and bulky parts near the size limits can draw additional handling and large package charges on top of dimensional weight, so a live rate quoted without the real box size will come in low.
7. FedEx
FedEx Ground accepts packages up to 150 pounds, 108 inches long and 165 inches in length plus girth, with a dimensional weight divisor of 139 for US shipments. The FedEx integration with Web Shop Manager shows calculated FedEx rates at checkout, creates tracking numbers automatically, and FedEx supports dangerous goods shipping for specialized automotive components.
Who it fits: parts sellers who want a second parcel carrier to compare against UPS, or who ship regulated items that fall under FedEx’s dangerous goods rules.
Where it falls short: the same size limits and oversize charges apply as with UPS, and some FedEx services carry lower weight caps than FedEx Ground, so check the service you plan to offer.
8. USPS
USPS delivers to every US address. USPS Ground Advantage accepts packages up to 70 pounds and 130 inches in length plus girth, and dimensional weight applies only above one cubic foot. The USPS integration with Web Shop Manager shows real-time USPS rates and creates labels, with flat rate options and return labels.
Who it fits: small, light parts such as emblems, gaskets, sensors, filters and bulbs, and deliveries to PO boxes.
Where it falls short: the 70 pound limit rules out most heavy parts, and large light boxes still bill on dimensional weight.
9. Red Stag Fulfillment
Red Stag Fulfillment is a third-party logistics (3PL) company that says it specializes in large, heavy and bulky products, with warehouses in Sweetwater, Tennessee and Salt Lake City, Utah. Its site invites brands with products “bigger than a toaster or heavier than 10 pounds.” It is not a Web Shop Manager partner.
Who it fits: brands that want to hand off storage, picking and shipping of bulky parts instead of running their own warehouse.
Where it falls short: its site does not mention automotive parts, and with two warehouses you should check transit times to the regions your customers are in. Ask any 3PL how orders reach it from your store, how it handles fitment-sensitive returns, and how it bills oversized storage.
| Option | Type | Best for | Where it works |
|---|---|---|---|
| Freightcom | Freight and parcel marketplace | Heavy parts, Canada and cross-border | Live quote at checkout (6.0) |
| TForce Freight | LTL carrier | Pallets and crates in the US | LTL quote at checkout, bill of lading |
| ParcelPath | Discounted labels, LTL access | Lower UPS and USPS label costs | After the order |
| ShipStation | Web shipping software | Multichannel sellers | After the order |
| ShipWorks | Desktop shipping software | High-volume warehouses | After the order |
| UPS | Parcel carrier | Everyday parcels up to 150 lb | Rates at checkout, labels |
| FedEx | Parcel carrier | Second carrier, dangerous goods | Rates at checkout, labels |
| USPS | Parcel carrier | Small, light parts up to 70 lb | Rates at checkout, labels |
| Red Stag Fulfillment | 3PL | Outsourced bulky fulfillment | Storage, picking and shipping |
How shipping connects to your store
Shipping touches a parts store in two places, and it helps to keep them apart when you compare options.
- At checkout: the price the shopper sees. The store asks the carrier for a rate using the cart’s weight and dimensions and the shipping address. On Web Shop Manager, UPS, FedEx and USPS rates and TForce Freight LTL quotes can show at checkout, and on Web Shop Manager 6.0 the Freightcom application quotes freight inside the checkout request. For stores on Web Shop Manager 6.0, our freight and LTL shipping integration covers TForce Freight, Freightcom and UPS Air Freight, and we deploy and operate it for you.
- After the order: labels, bills of lading and tracking. Orders flow to shipping software such as ShipStation or ShipWorks, to a label service such as ParcelPath, or to a 3PL. Tracking numbers come back to the order so the customer can follow the shipment.
Whatever you choose, the data underneath decides the result. Fitment tells the shopper the bumper fits their truck. Shipping weight, box dimensions and freight class tell the carrier what it costs to get it there. Both belong on every product before you switch on live rates.
Frequently asked questions
When should an auto part ship LTL freight instead of parcel?
When it is over the parcel limits, or close enough that oversize charges cost more than a pallet. UPS and FedEx Ground stop at 150 pounds and 165 inches in length plus girth, and USPS Ground Advantage stops at 70 pounds. Bumpers, hard bed covers, transmissions and multi-box kits often ship cheaper and safer on a pallet.
What is dimensional weight and how does it affect parts shipping?
Dimensional weight is a billing weight based on box size: length times width times height, divided by the divisor the carrier publishes, 139 for UPS and FedEx on most US commercial rates. Carriers charge whichever is higher, dimensional or actual weight, so long, light parts such as bed covers and light bars often bill well above their scale weight.
Can my store show a live freight quote at checkout?
Yes, if your platform connects to a freight carrier or marketplace and your heavy products carry accurate weights, dimensions and freight class. On Web Shop Manager, TForce Freight returns LTL quotes at checkout, and on Web Shop Manager 6.0 the Freightcom application quotes freight inside the checkout against your own Freightcom account.
Do I need ShipStation or ShipWorks if my store already shows carrier rates?
Not necessarily. Checkout rates set the price the shopper pays. ShipStation and ShipWorks help after the sale with batch labels, routing rules and orders from other channels such as Amazon and eBay. They are most useful once you ship many orders a day or sell on several channels.
Why do residential freight deliveries cost more?
LTL carriers add accessorial charges for deliveries that need extra handling, most often residential delivery and a liftgate when there is no loading dock. Ask the shopper at checkout whether the address is a home or a business with a dock, so the quote includes those charges up front.
Should a parts seller use a 3PL?
It can make sense when storage, picking and shipping are taking more time and space than you want to manage. For bulky parts, look for a 3PL that handles large and heavy products, and ask how orders reach it from your store and how it bills oversized storage and returns.
See freight quoted at checkout on a parts catalog
If heavy parts are where your shipping math goes wrong, we can show you live freight and parcel rates on a real parts catalog.