How to ship a used engine or transmission without losing the profit on it.

Most parts ship in a box with a label. Engines and transmissions go as freight on a pallet, and a handful of things decide whether that goes smoothly or eats the margin.

Parcel or freight

Parcel carriers cap the weight and size of a single package, and an engine or a complete transmission is usually past those limits. That leaves less-than-truckload (LTL) freight: the unit rides on a pallet alongside other shippers' freight, and the price depends on its weight, its freight class and the services needed at each end. Smaller drivetrain parts, such as a transfer case or a differential, can sometimes go by parcel if they are packed within the carrier's limits.

Drain and prepare it

• Drain every fluid

  Oil, coolant, transmission fluid and any fuel. Carriers check the dipstick and look for leaks, and a unit that drips can be refused at the dock. Drain it from the plugs and give it time to finish, ideally overnight.

• Cap and plug the openings

  Ports, lines, and the intake and exhaust openings, so nothing gets in on the way and nothing left inside gets out.

• Photograph it as it leaves

  The packed unit on its pallet, from every side. If it arrives damaged, those photos are where the claim starts.

• Label it on two sides

  The shipping label and the bill of lading number on two sides of the wrap, so the pallet can still be matched to its paperwork if one side is torn.

Pallet or crate

Set the unit in the middle of a sound pallet, resting on its mounts rather than on the oil pan, and bolt or strap it down so it cannot shift. Put absorbent pads underneath for anything the draining missed. Cover it with cardboard and shrink-wrap it, leaving the dipstick where the carrier can reach it. A crate costs more to build but protects better; make its lid easy to lift for the carrier's inspection.

Weight, size and freight class

An LTL price depends on freight class as well as weight. Since the National Motor Freight Classification change of July 2025, the class for many auto parts follows density: the packed weight against the space the pallet takes up. Weigh the packed pallet and measure its length, width and height, pallet included. If the bill of lading understates either, the carrier reweighs or reclasses the shipment and bills the difference after delivery.

Liftgate, residential and terminal delivery

The base rate assumes a business with a loading dock. Delivering to a home, needing a liftgate to lower the pallet from the truck, or calling ahead before delivery each usually add a charge. Ask the buyer where it is going before quoting: a repair shop with a forklift costs less to deliver to than a driveway, and a buyer who collects from the carrier's terminal often pays least of all.

Price the freight in before you list

A buyer compares the delivered total, so freight belongs in the listing before it sells, not in a message afterwards. Keep a shipping option sized for freight, separate from the ones for small and heavy parcels, and put every engine and transmission on it. A flat rate that undercharges freight sells quickly and loses money every time; our guide to pricing used auto parts covers building it into the price.

Questions yards ask

Can I ship an engine by parcel?

Usually not. An engine is past the weight and size limits for a single parcel, so it goes as LTL freight on a pallet or in a crate.

Do I have to drain an engine before shipping it?

Yes. Drain the oil, coolant and any fuel. Carriers check the dipstick and can refuse a unit that leaks. Draining is carrier preparation, not hazmat clearance: residual fuel can still make a unit regulated, so confirm with your carrier. This is general guidance, not legal advice.

What freight class is a used engine?

It depends on how the pallet is packed. Since July 2025 the class for many auto parts follows density, so weigh and measure the packed pallet and let the density set the class.

Why did my freight bill go up after delivery?

Usually a reweigh or reclass, because the weight or size on the bill of lading was lower than the carrier measured, or a delivery charge such as a liftgate or residential fee that was not on the quote.

How should I charge shipping on an engine?

As freight, priced before the listing goes up, on a shipping option kept for freight-sized parts. A buyer compares the delivered total.