Free Shipping across all 48 states 3-year warranty

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Tested.Tagged.Shipped free.

Low-mileage OEM engines and transmissions for cars, trucks and SUVs. Every unit is tested, matched to your VIN and delivered by liftgate truck to your home or repair shop.

Warranty
3 years
Mileage
35K–65K
Freight
Free, liftgate
Westmont Auto PartsSample

Inspection tag

Unit
5.3L V8 engine
Miles
48,210
Stock no.
W53-0142

Compression test, by cylinderpsi

  1. 1165
  2. 3168
  3. 5164
  4. 7161
  5. 2162
  6. 4160
  7. 6166
  8. 8163
Result
Sample inspection tag: a 5.3L V8 with 48,210 miles. Compression on all eight cylinders reads between 160 and 168 psi. Result: pass.

Find your engine or transmission

Checking our hours

Step 1: your vehicle

Choose a year.

Choose a make.

Enter your model.

Start with your make

    Why a used OEM unit makes sense

    It's the same engine or transmission your vehicle was built with, tested and priced well below new.

    CompareUsed OEM from WestmontRemanufacturedNew from a dealer
    PriceLowestHigherHighest
    Factory-original partsYesMix of rebuilt and new partsYes
    Mileage35K–65K, verifiedZero after rebuildZero
    Tested before it shipsCompression or shift testVaries by rebuilderFactory tested
    Warranty3-year, includedVaries by rebuilderManufacturer warranty
    Freight to your doorFree in the lower 48VariesVaries
    Not satisfied?30-day returns, we pay return freightVaries by rebuilderVaries by dealer

    How it works

    Four steps from your request to your driveway or repair shop.

    1. Send your vehicle

      Use the part finder or call us. Your year, make and model, or your VIN, is all we need.

    2. Confirm the match

      A specialist checks the exact engine or transmission code for your VIN, then sends one price with freight included.

    3. Test, tag and crate

      Before it ships, your unit is tested, tagged with its results, sealed and strapped to a pallet.

    4. Deliver by liftgate

      A freight truck lowers it at your home or repair shop. You get tracking when it leaves.

    Concept rendering

    3-yearwarranty on every unit

    Covers internal engine and transmission parts. If a covered part fails, we repair it, replace the unit or refund you, and we pay the freight both ways. Read the full warranty terms

    Get my price

    Checked before it ships

    What happens to your unit before it leaves our dock.

      Free freight to all lower 48 states

      Your unit ships on a pallet by freight truck with a liftgate, so the driver can lower it to the ground. Shops with a forklift get the fastest drop-off.

      Questions, answered

      Checking our hours

      Talk to a parts specialist

      (888) 555-0199

      Mon–Fri 8 AM–7 PM ET, closed Saturday and Sunday

      Will this engine fit my vehicle?

      Send us your VIN with your quote request. A specialist matches the exact engine or transmission code to your vehicle before you pay, so you get the right unit the first time.

      What comes with the engine?

      Engines ship as a long block or a complete assembly, depending on the unit. Your quote lists exactly what's included, such as the intake, sensors and accessories, so there are no surprises at delivery.

      How does free freight work?

      We ship on a pallet by freight truck to any address in the lower 48. Liftgate service is included, so the driver can lower your unit to the ground. Repair shops with a forklift get the fastest drop-off.

      What does the warranty cover?

      Every unit includes a 3-year warranty covering internal engine and transmission parts. Read the full terms in our limited warranty.

      Can I return a part if I'm not satisfied?

      Yes. Return it within 30 days of delivery for any reason, as long as it hasn't been installed, and we pay the return freight. There's no restocking fee. Our Return policy has the details.

      Is there a core charge?

      If a core return applies to your part, it's shown on your quote before you pay. Nothing is added after delivery.

      How long does delivery take?

      Allow up to 10–12 business days. That's our maximum, and it's there for a reason: we inspect every part a second time before it ships, so what arrives is exactly what you paid for. You get a tracking number as soon as your unit leaves our dock.

      Can you ship straight to my mechanic?

      Yes. Choose "Repair shop or business" in the part finder and give us the shop's ZIP. Most customers ship directly to the shop doing the install.

      How do I pay?

      We accept Visa, Mastercard, American Express and Discover. You get a written invoice with your unit, mileage and warranty before anything ships.

      Your price is a minute away.

      Tell us your vehicle. We'll call or text with a price for the right engine or transmission, freight included.

      Back to home

      Policies

      Effective November 12, 2026

      Not satisfied with your part? Send it back within 30 days of delivery, and we pay the return freight.

      Return window
      30 days from delivery
      Return freight
      Paid by Westmont
      Restocking fee
      None
      Refund
      To your original payment method

      Returns for any reason

      If you're not satisfied with an engine, transmission, transfer case, differential or other part you bought from us, you can return it within 30 days of delivery for any reason, as long as it hasn't been installed. We schedule the freight pickup and pay for it.

      How to start a return

      1. Call (888) 555-0199 or email sales@westmontautoparts.com with your order reference number and the reason for your return.
      2. We send you a return authorization (RMA) number and freight instructions, usually within one business day.
      3. Drain the fluids and strap the unit to its original pallet, or one like it. We'll tell you exactly how to prepare it.
      4. Our freight carrier picks it up from your address. The pickup costs you nothing.

      Ship a return only after you have a return authorization number. Freight that arrives without one can't be matched to your order, which delays your refund.

      Condition of returned parts

      To qualify for a return, the unit must:

      • Come back complete, with everything it shipped with
      • Not be taken apart, modified or damaged after delivery
      • Still carry our identification marks, paint markings and inspection tag

      Installed parts

      Once a unit has been installed, it's covered by our 3-year limited warranty instead of this return window. If an installed unit has a problem, we repair it, replace it or refund you under the warranty, and we still pay the return freight. We can't take back an installed unit only because you changed your mind.

      Wrong or damaged parts

      If we send the wrong part, or your part arrives damaged, tell us within 48 hours of delivery. We send the right part or a replacement, or refund you in full, and we pay the freight both ways. Note any visible damage on the delivery receipt before you sign it; our Shipping policy explains how.

      Exchanges

      Prefer a different unit? We can exchange your part instead of refunding it. If the new unit costs more or less, we charge or refund the difference.

      Core charges

      If your invoice includes a core charge, it explains how and when to return your old unit for a core refund.

      Your refund

      We inspect your return when it arrives and issue your refund within 3 business days. Our Refund policy has the details.