51
verified 2004 gmc engines
2004 Used GMC Engines For Sale
51 verified 2004 GMC engines in stock — Sierra 1500 (4.3L, 4.8L, 5.3L, 6.0L), Sierra Denali (6.0L), Sierra HD 2500/3500 (6.0L gas, 8.1L Vortec, 6.6L Duramax LB7/LLY turbodiesel), Yukon & Yukon XL, Canyon (2.8L/3.5L), Envoy / Envoy XL / Envoy XUV, Suburban, Savana Van, plus Safari and Jimmy. VIN-matched to your truck, compression-tested by ASE-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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Compression-Tested & Verified
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Free Nationwide Shipping
Browse 2004 GMC Engines by Model
Pick your 2004 GMC model to see exact fitments in stock. Not sure which engine code fits? Text us your VIN and a specialist confirms the match against the 8th-digit code.
2004 Sierra 1500
4.3L V6 (VIN X), 4.8L V8 (VIN V), 5.3L V8 (VIN T / VIN Z), and 6.0L V8 (VIN U / high-output VIN N). The GMT800 half-ton workhorse, Compression-Tested and warrantied.
2004 Sierra Denali
6.0L V8 (VIN U) all-wheel-drive premium half-ton. Confirm the 8th-digit VIN before ordering — the Denali engine is not shared with base Sierra trims.
2004 Sierra HD 2500/3500
6.0L gas (VIN U), 8.1L Vortec 8100 (VIN G), and 6.6L Duramax turbodiesel — 2004 spans both the early LB7 (VIN 1) and the mid-year LLY (VIN 2), in Federal (opt NF2/NF4) and California calibrations.
2004 Yukon & Yukon XL
Yukon 4.8L / 5.3L (VIN T/Z) / 6.0L; Yukon XL 1500 5.3L / 6.0L; Yukon XL 2500 6.0L (VIN U) and 8.1L (VIN G). Match the half-ton vs three-quarter-ton chassis before ordering.
2004 Canyon
First-year Canyon: 2.8L inline-four (VIN 8) and 3.5L inline-five (VIN 6) Atlas engines. The compact-pickup replacement for the Sonoma.
2004 Envoy / XL / XUV
4.2L Atlas inline-six (VIN S) across Envoy, Envoy XL, and the new midgate XUV, plus the 5.3L V8 (VIN P) in the XL and XUV. Confirm body style before ordering.
2004 Suburban
Suburban 1500 5.3L V8 (VIN T/Z) and Suburban 2500 6.0L (VIN U) plus 8.1L Vortec 8100 (VIN G). VIN-matched to the half-ton or three-quarter-ton platform.
2004 Savana Van
Savana 1500 / 2500 / 3500 in 4.3L (VIN X), 4.8L (VIN V), 5.3L (VIN T), and 6.0L gasoline (VIN U). Cargo and passenger full-size van engines, tested and warrantied.
2004 Safari & Jimmy / Sonoma
4.3L Vortec V6 (VIN X) for the Safari minivan and the compact Jimmy, S10/S15, and Sonoma. The long-running 4.3L, Compression-Tested and ready to ship.
Why Buy a 2004 GMC Engine from Auto Power Source
Every 2004 GMC engine in our inventory is pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Each unit goes 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 compression-test every cylinder and run a leak-down evaluation before any 2004 GMC engine is cleared for sale — from the Vortec 4.3L V6 to the 8.1L big-block and the 6.6L Duramax turbodiesel. You pay a fraction of dealer-new pricing for identical GM engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and get up to a 3-year warranty plus 30-day money-back. Not sure which 2004 variant fits? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 2004 GMC Engine Options: Compared
Most 2004 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 |
None |
DIY |
Tested used OEM hits the sweet spot — same GM engineering as new, fraction of the cost.
2004 GMC Engine Buying Guide
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Confirm the 8th-digit VIN code. 2004 GMC trucks share displacements across very different engines — a 5.3L can be VIN T or VIN Z, and a 6.0L can be VIN U or the high-output VIN N. The VIN code is the authority.
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On Sierra/Yukon HD, identify the Duramax variant. 2004 is the LB7-to-LLY changeover year — early trucks use the LB7 (VIN 1), later trucks the LLY (VIN 2), with Federal (opt NF2/NF4) and California calibrations. They are not interchangeable.
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Match the chassis (1500 vs 2500/3500). Half-ton, three-quarter-ton, and one-ton trucks differ in block, accessories, and mounts even at the same displacement.
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Note the Atlas inline engines. Envoy and Canyon use the 4.2L I6 (VIN S), 3.5L I5 (VIN 6), and 2.8L I4 (VIN 8) Atlas family — distinct from the Vortec V6/V8 truck engines.
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Always run the donor VIN if available. We provide it on request for any engine in our inventory to verify mileage and history.
Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.
Frequently Asked Questions
What is the warranty on a 2004 GMC engine?
Up to 3 years, depending on the specific unit. The exact warranty term is listed on each product page.
What does compression-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before the engine is cleared for sale.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent before payment.
Do I need my VIN?
Strongly recommended. 2004 GMC engines vary by displacement, 8th-digit VIN code, drivetrain, and — on HD trucks — the Duramax LB7/LLY changeover.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
Every 2004 GMC engine we ship has been through these six steps:
1. VIN-MatchingWe match the donor VIN to your VIN to confirm engine code, emissions calibration, and drivetrain fit.
2. Tested & VerifiedASE-certified technicians compression-test every cylinder and run a leak-down evaluation on each engine.
3. Noise & Smoke VerificationUnits are run to verify normal mechanical sound and clean operation — catches wear static tests miss.
4. Visual InspectionEvery accessible component is inspected: turbos, manifolds, valve covers, accessories, sensor harnesses.
5. Photograph & CatalogMulti-angle photos sent to you BEFORE we ship, for your approval.
6. Palletize & ShipStrapped on a heavy-duty wooden pallet, shipped via freight at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the car the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 2004 GMC engine leaves our warehouse, we 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 a 3-year warranty.
✉ Email Us at info@autopowersource.com
