Used GMC Engines For Sale

Hundreds of
verified units in stock
5.0 ★ Google
4.8 ★ Trustpilot
verified customer ratings
3 years
max warranty
Photos before
shipment

Used GMC Engines For Sale

Verified used gmc engines in stock — VIN-matched, ASE-tested by certified technicians, photographed before shipment, backed by up to a 3-year warranty plus 30-day money-back. Free freight nationwide.

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Up to 3-Year Warranty
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Photos Before Shipment
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ASE-Tested & Verified
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Free Nationwide Shipping
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30-Day Money-Back
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Secure SSL Checkout

GMC Engines We Cover

GMC engines power Sierra pickups, Yukon and Acadia SUVs, and Savana cargo vans — sharing the GM small-block, Vortec, and Duramax architectures with Chevrolet and Cadillac. Our verified GMC engines cover the 4.3L V6, 5.3L EcoTec3 V8, 6.0L L96, 6.2L L86/L87, and the 6.6L Duramax LB7/LBZ/LMM/LML/L5P turbo-diesels.

Used GMC 5.3L EcoTec3 V8 engine
5.3L EcoTec3 V8
Sierra 1500, Yukon, Yukon XL, Denali (1999-present). GM's high-volume light-duty V8 — most-shipped GMC V8 in our inventory.
 Used GMC 6.2L L86/L87 V8 engine
6.2L L86/L87 V8
Sierra 1500 Denali, Yukon Denali, Yukon XL Denali (2014-present). GM's premium light-duty V8 — direct injection, 420 hp class.
 Used GMC 3.6L LFX V6 engine
3.6L LFX V6
Acadia, Terrain, Canyon (2012-present). GM's modern DOHC HFV6 — direct injection, high-volume crossover engine.
 Used GMC 6.6L Duramax Diesel V8 engine
6.6L Duramax Diesel V8
Sierra HD 2500/3500 (2001-present). The LB7/LLY/LBZ/LMM/LML/L5P Duramax — workhorse heavy-duty diesel.
 Used GMC 5.7L 350 Small-Block V8 engine
5.7L 350 Small-Block V8
C/K trucks, Sierra, Yukon, Suburban (1990s era). Classic GM 350 small-block — legendary durability and parts availability.
 Used GMC 6.0L Vortec V8 LS engine
6.0L Vortec V8 LS
Sierra HD, Savana 2500/3500, Yukon XL HD. LS-family heavy-duty V8 — 2500/3500 series workhorse.
 Used GMC 4.3L Vortec V6 engine
4.3L Vortec V6
Sierra 1500, Sonoma, Jimmy, Safari, Savana. 90-degree V6 derived from small-block V8 architecture.
 Used GMC engine inventory
More GMC Engines
Plus 5.3L Generation IV LS, 6.2L L86 EcoTec3, 2.8L Duramax, 3.5L V6, 4.8L Vortec, and more — text us your VIN.
Sierra
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Yukon
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Acadia
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Terrain
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Canyon
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Savana
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Envoy
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Jimmy
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Sonoma
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Safari
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Why Buy a GMC Engine from Auto Power Source

Every GMC engine in our inventory has been pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Each unit went through our six-step inspection — VIN-matching, ASE testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping. Our ASE-certified technicians do the testing; rejected units never reach the buyer.

You pay a fraction of dealer-new pricing for identical GMC engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and you have 30 days from delivery to return for any reason — no restocking fees. Up to a 3-year warranty covers you if anything goes wrong after install.

📱 Fastest way to match: text us your VIN, get options in minutes. Text Your VIN →

Your GMC Engine Options: Compared

Most GMC owners face four real choices when their engine fails:

← Swipe sideways to see all columns →
Option Cost Reliability Warranty Fitment Match
Used OEM (this collection) $$$ Best Value High Up to 3 years VIN-matched
New OEM (dealer) $$$$$ 2-4× more High Manufacturer Exact
Aftermarket / Reman $$$$ Varies 6-12 mo May adapt
Junkyard $ Cheapest Unknown DIY

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

GMC Engine Buying Guide

Five things to verify before buying a used GMC engine:

  1. Match the engine code by VIN 8th digit. Even within the same GMC model and year, multiple engine variants are common.
  2. Confirm trim level and drivetrain. GMC bracketry, mounting, and harness routing change between FWD/AWD and trim packages.
  3. Specify 2WD vs 4WD where applicable. Oil pans, output shafts, and bell-housings often differ.
  4. Check for emissions calibration match. California-spec and Federal-spec units sometimes use different ECU calibrations.
  5. Verify accessory configuration. A/C compressor, alternator, and power steering brackets must match your vehicle.

Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.

📞 Need help choosing the right engine code? Talk to our team live, 24h Mon-Sat. Call 1-877-313-8995

Frequently Asked Questions

What is the warranty?
All GMC engines include a warranty up to 3 years, depending on the specific unit.
What does ASE-tested mean?
ASE-certified technicians compression-test every cylinder and run leak-down evaluation on engines. Transmissions are Shift-Tested through all gears. Plus noise & smoke verification, visual inspection, and multi-angle photography before shipment.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days after dispatch via freight carrier.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit sent before payment.
Do I need my VIN?
Strongly recommended for exact-fit matching.
What if I do not approve the photos?
Every dollar back. No restocking fees, no return freight charges. Pay first, see your exact unit, ship third — full refund if you do not approve.
Why cheaper than dealer new?
Used OEM from low-mileage donors. Same GMC engineering.
When can I reach customer service?
24 hours Monday through Saturday.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
5.0 ★ Google
4.8 ★ Trustpilot
verified customer ratings

Our 6-Step Inspection & Shipping Process

Every unit we ship has been through these six steps:

1. VIN-Matching
We match the donor VIN to your VIN to confirm engine code, emissions calibration, and drivetrain fit.
2. Tested & Verified
ASE-certified technicians compression-test every cylinder and run leak-down evaluation on each engine. Transmissions are Shift-Tested through all gears.
3. Noise & Smoke Verification
Engines are run on the test stand to verify normal mechanical sound, clean exhaust, and no abnormal smoke — catches internal wear static pressure tests miss.
4. Visual Inspection
Every accessible component is inspected: turbos, manifolds, valve covers, accessories, sensor harnesses.
5. Photograph & Catalog
Multi-angle photos sent to you BEFORE we ship for your approval.
6. Palletize & Ship
Strapped on a heavy-duty wooden pallet, shipped via freight at no charge.

What Our Customers Say

5.0 ★ on Google · 4.8 ★ on Trustpilot. Real reviews from our Trustpilot profile.

★★★★★
Verified Trustpilot
Great communication
"Kevin Graham was very thorough and clear about everything I needed. The engine arrived exactly as described and the photos before shipment gave me peace of mind."
— Kevin Graham, 2026-03-29
★★★★★
Verified Trustpilot
Curtis was excellent
"Curtis Haines answered every question I had about VIN matching and warranty. Smooth transaction from start to finish."
— Curtis Haines, 2026-03-28
★★★★★
Verified Trustpilot
Highly recommend Mike
"Mike reached out to me first thing in the morning regarding an inquiry I made for a used engine. He was very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Verified Trustpilot
Great experience start to finish
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she worked to find a different engine quickly."
— Bryan Perkins, 2026-03-25

Our Photos-Before-Shipment Guarantee

Before any engine leaves our warehouse, we dismantle the donor unit and send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. On top of 30-day money-back and up to 3-year warranty. Have a question about the guarantee or your specific order?

✉ Email Us at admin@autopowersource.com
No match? Text VIN →