211
verified 1999 gmc engines
1999 Used GMC Engines For Sale
211 verified 1999 GMC engines in stock — 1999 was the launch year of the GMT800 Sierra 1500 (4.3L V6, 4.8L Vortec LR4 and 5.3L Vortec LM7) running beside the outgoing GMT400 "classic" 2500/3500 heavy-duty trucks (5.0L, 5.7L, the 7.4L Vortec 7400 big-block and the 6.5L turbo-diesel), plus Savana full-size vans, Suburban and the new Yukon Denali, and the S-10/Sonoma/Jimmy/Safari compacts. Every unit is VIN-matched to your truck, compression-tested by ASE-certified technicians, photographed before shipment, and 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 1999 GMC Engines by Model
1999 is the changeover year for GMC trucks — the brand-new GMT800 Sierra 1500 arrived while the heavy-duty 2500/3500 trucks carried on as the outgoing GMT400 "classic" body. Pick your model below to see the fitments in stock. Not sure which Vortec code fits? Text us your VIN and a specialist confirms the 8th-digit match.
1999 Sierra 1500 (1999 Up)
First-year GMT800 half-ton: 4.3L V6 (VIN W), 4.8L Vortec LR4 (VIN V), and 5.3L Vortec LM7 (VIN T). Brand-new block for 1999 — VIN-matched and compression-tested.
1999 Sierra 2500 (1999 Up)
New-body 3/4-ton: 6.0L Vortec LQ4 (VIN U, 8-364) and 5.3L Vortec (VIN T). Confirm light-duty vs heavy-duty 2500 before ordering.
1999 Classic 2500/3500 (2000–2001 Down)
Outgoing GMT400 heavy-duty: 5.0L (VIN M), 5.7L (VIN R) gas & CNG, 7.4L Vortec 7400 (VIN J/N) big-block, and the 6.5L turbo-diesel (VIN F/S). No 8.1L or Duramax yet in 1999.
1999 Yukon & Yukon Denali
Full-size Yukon 5.7L Vortec (VIN R) and the first-year Yukon Denali 5.7L (VIN R). The classic-body SUV before the GMT800 Yukon arrives in 2000.
1999 Suburban 1500/2500
Suburban 1500 (2001 Down) and Suburban 2500 (1967 Up): 5.7L (VIN R) small-block, 7.4L (VIN J) big-block, and the 6.5L turbo-diesel. Match GVWR class before you buy.
1999 Savana Van 1500/2500/3500
Full-size van: 4.3L (VIN W, 6-262), 5.7L (VIN R) gas & CNG, 7.4L (VIN J) big-block, and 6.5L turbo-diesel (VIN F). Wide spread — VIN confirms it.
1999 S-10 / S-15 / Sonoma
Compact pickup: 4.3L Vortec V6 (VIN W) plus the 2.2L four (VIN 4). The four-cylinder and V6 VIN codes are not interchangeable.
1999 Jimmy, Safari & Envoy
Compact Jimmy / S10-S15, Safari van, and the top-trim Envoy all run the 4.3L Vortec V6 (VIN W, 6-262). Tested and warrantied.
Why Buy a 1999 GMC Engine from Auto Power Source
Every 1999 GMC engine in our inventory is pulled from a low-mileage donor truck, cataloged by VIN, and held in our climate-controlled warehouse pending sale. Because 1999 is the first GMT800 model year, fitment is the whole game — a new-body Sierra 1500 long-block and a classic GMT400 2500 share displacement figures but not the block, accessories, or mounts. Each unit goes through our six-step inspection: VIN-matching, ASE compression 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 1999 GMC engine is cleared for sale — that matters on the high-mileage 5.7L Vortec and 6.5L diesel HD units. You pay a fraction of dealer-reman pricing for the same Vortec 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 whether your truck is a 1999-Up new body or a 2001-Down classic chassis? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 1999 GMC Engine Options: Compared
Most 1999 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) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ rarely stocked |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM hits the sweet spot — same Vortec engineering as the factory unit, at a fraction of the cost, and a brand-new long-block for a 1999 truck is no longer realistic.
1999 GMC Engine Buying Guide
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Read the 8th-digit VIN code. On a 1999 GMC the 8th digit is the engine ID — W=4.3L, V=4.8L, T=5.3L, U=6.0L, M=5.0L, R=5.7L, J=7.4L, F=6.5L turbo-diesel. Same liters can be a different engine.
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Identify new body vs classic. The 1500 (and light 2500) launched on the GMT800 platform ("1999 Up"); the HD 2500/3500 still shipped as the old GMT400 ("2000 Down" / "2001 Down"). The blocks are not interchangeable across that split.
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Match gas vs diesel and big-block. The 6.5L turbo-diesel (VIN F/S) and 7.4L Vortec 7400 (VIN J/N) are HD-only and share nothing with the small-block V8s. Confirm before ordering.
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Watch for CNG and gasoline 5.7L. Several 1999 Savana and 2500/3500 units came as 5.7L CNG (VIN R) — these are emissions-specific and distinct from the gasoline 5.7L.
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Always run the donor VIN if available. We provide it on request for any engine in our inventory so you can verify mileage and history before it ships.
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 1999 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 — a real check on these high-mileage Vortec and 6.5L diesel units.
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. 1999 GMC engines vary by 8th-digit code, new vs classic body, and gas/diesel/CNG configuration.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
Why is a used OEM engine cheaper than the dealer?
You are buying a VIN-matched, tested donor engine instead of a remanufactured or new long-block, so you skip the dealer markup while keeping factory Vortec engineering.
When can I reach customer service?
Our team is available 24 hours a day, Monday through Saturday, by phone at 1-877-313-8995 or by text.
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 1999 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, new-vs-classic body, 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: manifolds, valve covers, accessories, injection pump on diesels, 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 1999 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
