2024 Used GMC Engines For Sale

29
verified 2024 GMC engines
Trustpilot
Customer Reviews
Up to 3 yrs
extended warranty available
Photos before
shipment

2024 Used GMC Engines For Sale

29 verified used 2024 GMC engines in stock, every one matched by RPO option code and the 8th VIN digit before it ships — the 6.6L L8T gas big block and L5P Duramax in the Sierra HD, the 5.3L L84 and 6.2L L87 EcoTec3 V8s across Sierra 1500 and Yukon, and both 3.0L Duramax inline-sixes. Free freight, photos before we ship, 30 days to return.

●
Warranty On Every Unit
●
Photos Before Shipment
●
ASE-Tested & Verified
●
Free Nationwide Shipping
●
30-Day Money-Back
●
Secure SSL Checkout

2024 GMC Engine Families

Which engine sits under which 2024 GMC, and how many of each we hold today.

Engine family Fits (2024) In stock
6.6L L8T Big-Block V8 (Gas) Sierra 2500 HD / 3500 HD and Savana 2500 / 3500 — VIN 7, the 401-hp gas big block 6
6.6L L5P Duramax Turbo-Diesel V8 Sierra 2500 HD / 3500 HD, Denali included — VIN Y 4
5.3L L84 EcoTec3 V8 Sierra 1500, Yukon, Yukon XL — VIN D, Dynamic Fuel Management 4
6.2L L87 EcoTec3 V8 Sierra 1500 and Denali, Yukon, Yukon XL — VIN L, 420 hp 4
2.7L L3B TurboMax I4 Canyon and Sierra 1500 — VIN K, the turbocharged four 2
4.3L LV1 EcoTec3 V6 Savana 2500 and 3500 — VIN P, the last pushrod V6 in the vans 2
3.0L LZ0 Duramax Turbo-Diesel I6 Sierra 1500 and Sierra Denali 1500 — VIN 8, second-generation 3.0 2
3.0L LM2 Duramax Turbo-Diesel I6 Yukon and Yukon XL — VIN T, first-generation 3.0 inline-six 2
1.5L LSD Turbo I4 Terrain FWD and AWD — VIN G 2
2.5L LK0 I4 Acadia — VIN S 1
Total 29

Other GMC Model Years

Every model year we hold GMC engines for. Years without a link are in stock but have no year page yet — text us your VIN.

2024
2023
2022
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990

Why Buy a 2024 GMC Engine from Auto Power Source

2024 is the year GMC’s engine lineup is identified almost entirely by RPO option code rather than displacement. Three different 6.6L V8s do not exist — but two do, and they share nothing: the L8T is a gasoline big block, the L5P is the Duramax turbo-diesel, and both are listed as “6.6L” on the Sierra 2500 HD and 3500 HD. The RPO code on the sticker, and the 8th digit of the VIN, are what separate them.

The same holds for the two 3.0L Duramax inline-sixes. The Yukon and Yukon XL carry the first-generation LM2 (VIN T); the Sierra 1500 carries the updated LZ0 (VIN 8). Both read 3.0L, both are turbo-diesel sixes, and they are not interchangeable. On the gasoline side the 5.3L L84 and 6.2L L87 EcoTec3 V8s run Dynamic Fuel Management across Sierra 1500, Yukon and Yukon XL, while the 2.7L L3B TurboMax four covers the Canyon and the base Sierra 1500.

Denali is a trim, not a drivetrain — a Sierra Denali 1500 takes the same L84 or L87 as an SLE, so we list them together and let the RPO code decide. Every unit here is used OEM pulled from a low-mileage donor vehicle, cataloged against its VIN, compression-tested and leak-down evaluated by ASE-certified technicians, photographed for your approval, and shipped free on a pallet with 30 days to return it.

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

Your 2024 GMC Engine Options: Compared

Most 2024 GMC owners face four real choices when the engine fails:

← Swipe sideways to see all columns →
Option Cost Reliability Warranty Fitment Match
Used OEM (this collection) $$$ Best Value High — tested Included VIN-matched
New OEM (dealer) $$$$$ 2-4× more High Manufacturer Exact
Aftermarket / Reman $$$$ Varies 6-12 mo May adapt
Junkyard $ Cheapest Unknown None DIY

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

2024 GMC Engine Buying Guide

5 things to verify before buying a used 2024 GMC engine:

  1. Settle which 6.6L you need before anything else. The L8T is the gasoline big-block V8 (VIN 7); the L5P is the Duramax turbo-diesel (VIN Y). Both appear as “6.6L” on a 2024 Sierra 2500 HD or 3500 HD. They share no parts and no mounting.
  2. The two 3.0L Duramax sixes are different engines. LM2 (VIN T) is the Yukon and Yukon XL unit; LZ0 (VIN 8) is the updated Sierra 1500 unit. Same displacement, same layout, separate part numbers.
  3. Read the RPO code, not just the displacement. GMC identifies 2024 hardware by option code — L84, L87, L3B, LV1, LSD, LK0. The code appears on the service parts identification label and is the fastest way to confirm what came out of your truck.
  4. Trim badges do not change the engine. A Sierra Denali 1500 and an SLE 1500 can carry the identical L84 or L87. Match on the option code and VIN digit; ignore the badge.
  5. Confirm the match with your own VIN before you order. Your VIN settles the engine code, drivetrain and build split in one step. Text it to +1-307-441-5554 and we will confirm in writing exactly which unit fits your vehicle before you pay.

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

📞 Need help choosing the right 2024 GMC engine? Talk to our team live.Call 1-877-313-8995

Frequently Asked Questions

What is the warranty on a used 2024 GMC engine?
Every 2024 GMC engine ships with a warranty included, printed on each product page. Extended coverage of up to 3 years is available at checkout.
What does ASE-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation, then noise and smoke verification, a full visual inspection, and multi-angle photography before shipment.
How long until delivery?
Prep and ship is 3-5 business days, transit 2-3 business days after dispatch by freight carrier.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent before payment. If you do not approve them, you get every dollar back.
Do I need my VIN?
Yes. On a 2024 GMC the 8th digit separates the 6.6L L8T gas V8 from the 6.6L L5P Duramax, and the LM2 from the LZ0 3.0L diesel. Text your VIN to +1-307-441-5554.
Which 2024 GMC models do you stock?
Sierra 1500, Sierra 2500 HD and 3500 HD including Denali, Savana 2500 and 3500, Yukon, Yukon XL, Terrain, Acadia and Canyon.
Why cheaper than dealer new?
Used OEM from low-mileage donor vehicles — the same GM engineering and the same RPO-coded hardware, at a fraction of a new crate price.
When can I reach customer service?
Call 1-877-313-8995 or text +1-307-441-5554 during the hours in the site footer, or email info@autopowersource.com.
🏆 Earn $500 with Our Rewards Program
Every GMC engine you buy earns rewards. 10 orders (yours or referred) = $500 cash credit. Silver, Gold, and Platinum tiers with discounts, priority support, and private inventory access.
See How Rewards Work →
100K+
Engines+Transmissions In Stock
0%
fitment-related returns
All 50
states covered, free freight
36
brands covered

Our 6-Step Inspection & Shipping Process

Every 2024 GMC engine we ship has been through these six steps:

1. VIN-Matching
We match the donor VIN to your VIN to confirm engine code, generation, emissions calibration, and drivetrain fit.
2. Tested & Verified
ASE-certified technicians compression-test every cylinder and run leak-down evaluation on engines. Transmissions are Shift-Tested through all gears.
3. Noise & Smoke Verification
Units are run to verify normal mechanical sound and clean operation — catches internal wear static tests miss.
4. Visual Inspection
Every accessible component is inspected: turbos, manifolds, valve covers, AFM/DFM lifters, 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.

Our Photos-Before-Shipment Guarantee

Before any 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 the warranty included with every unit. Browse all 29 2024 GMC engines below.

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