2023 Used GMC Transmissions For Sale

48
verified 2023 GMC transmissions
Trustpilot
Customer Reviews
Up to 3 yrs
extended warranty available
Photos before
shipment

2023 Used GMC Transmissions For Sale

48 verified used 2023 GMC transmissions in stock — the 10L80 ten-speed across Sierra 1500, Yukon and Yukon XL, the Allison 10L1000 behind every Sierra HD, and the transverse nine-speeds in Acadia and Terrain. Every one shift-tested, VIN-matched and shipped free.

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

2023 GMC Transmission Families

Which gearbox sits behind which 2023 GMC, and how many of each we hold today.

Transmission family Fits (2023) In stock
Allison 10L1000 10-Speed — 6.6L L8T Gasoline Sierra 2500 HD, Sierra 3500 HD and the Denali 2500 / 3500 with the gasoline 6.6L L8T V8, 4x2 and 4x4. 6
Allison 10L1000 10-Speed — 6.6L Duramax Diesel Sierra 2500 HD and 3500 HD option code MGM, plus the Denali 2500 / 3500 diesel listed under engine ID OMEF. 6
10L80 10-Speed Automatic — 3.0L Duramax Sierra 1500 and Sierra Denali 1500 with the 3.0L inline-six turbodiesel, option codes MQB and MQC, 4x2 and 4x4. 5
5.3L Half-Ton — 8-Speed or 10-Speed by Option Code Sierra 1500 and Sierra Denali 1500 5.3L V8. GM shipped this truck with an 8L90 or a 10L80 depending on the build; the listings carry option codes MHS and MHT, and your VIN settles which one you need. 5
9T65 9-Speed Automatic Acadia with the 2.0L turbo four or the 3.6L V6, front-wheel drive and all-wheel drive. 4
10L80 10-Speed Automatic — Yukon / Yukon XL 3.0L Duramax Yukon and Yukon XL 3.0L inline-six turbodiesel, 4x2 and 4x4 — the listings state 10 Speed outright. 4
10L80 10-Speed Automatic — Yukon / Yukon XL 5.3L Yukon and Yukon XL 5.3L V8, 4x2 and 4x4. 4
10L80 10-Speed Automatic — Yukon / Yukon XL 6.2L Yukon and Yukon XL 6.2L L87 V8, 4x2 and 4x4 — the Denali and Denali Ultimate driveline. 4
8L90 8-Speed Automatic — Sierra 1500 2.7L Turbo Sierra 1500 with the 2.7L turbocharged four, 4x2 and 4x4. 2
8L90 8-Speed Automatic — Savana 4.3L V6 Savana 2500 and Savana 3500 with the 4.3L V6. 2
9T45 / 9T50 9-Speed Automatic Terrain, front-wheel drive and all-wheel drive. 2
Canyon Automatic — Unit Confirmed by VIN Canyon 4x2 and 4x4. The 2023 Canyon listings carry the drive layout but no engine, and GM used more than one automatic across that line, so we confirm the exact unit from your VIN before quoting. 2
10L80 10-Speed Automatic — Sierra Denali 1500 6.2L Sierra Denali 1500 4x4 with the 6.2L L87 V8. 1
6L90 6-Speed Automatic Savana 2500 with the 6.6L L8T V8 — the one 2023 GMC line still on a six-speed. 1
Total 48

Other GMC Model Years

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

20242023
2022
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1997
1996
1995
1994
1993
1992
1991

Why Buy a 2023 GMC Transmission from Auto Power Source

2023 was the last full year of GM's pre-refresh T1 trucks and the first in which almost every GMC line ran a modern multi-speed automatic. The 10L80 ten-speed, the Allison 10L1000 on the HD trucks and the nine-speed transverse boxes in Acadia and Terrain are all electronically controlled to a degree older GM automatics never were, so a unit that physically bolts up can still behave badly if the calibration, the drive configuration or the option code is wrong. We do not sell on displacement alone. Every 2023 GMC transmission here is matched against your VIN before it is offered to you.

The half-ton is where 2023 gets genuinely confusing. A 5.3L Sierra 1500 left the factory with either an eight-speed or a ten-speed depending on the build, and our listings carry option codes — MHS, MHT, MQB, MQC — precisely because the displacement does not tell you which one is in your truck. The Sierra HD is the same story from the other direction: gasoline 6.6L L8T and 6.6L Duramax trucks both run an Allison ten-speed, and they are not the same unit. Send us the VIN and we will tell you in writing which one yours takes before you spend anything.

Everything is shift-tested under load by ASE-certified technicians before it is listed: clean engagement in every gear, no slipping, no abnormal noise, solenoid pack and cooler lines inspected. You get multi-angle photographs for approval before the unit ships, free freight to all fifty states, a 30-day money-back window and the warranty included with every unit. If the photos are not what you expected, you do not pay.

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

Your 2023 GMC Transmission Options: Compared

Most 2023 GMC owners face four real choices when the transmission 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.

2023 GMC Transmission Buying Guide

5 things to verify before buying a used 2023 GMC transmission:

  1. Start with the option code, not the engine. On a 2023 Sierra 1500 the engine narrows it down and nothing more — the MHS, MHT, MQB and MQC codes are what separate an eight-speed from a ten-speed. The code is on the glovebox or door-jamb RPO label.
  2. Check 4x2 against 4x4. A two-wheel-drive and a four-wheel-drive version of the same unit differ at the tailhousing and the output shaft. They are not interchangeable, and this is the single most common mismatch on GMC trucks.
  3. On an HD truck, confirm gas or diesel. The 2023 Sierra 2500 HD and 3500 HD both run an Allison ten-speed, but the gasoline 6.6L L8T and the 6.6L Duramax do not share the same unit. Option code MGM marks the diesel side, and the Denali HD diesel listings carry engine ID OMEF.
  4. On Acadia and Terrain, confirm the drive layout. The transverse nine-speeds come in front-wheel-drive and all-wheel-drive builds with different cases and output provisions. A FWD unit will not take the AWD transfer assembly.
  5. Confirm the match with your own VIN before you order. Your VIN settles the transmission 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 2023 GMC transmission? Talk to our team live.Call 1-877-313-8995

Frequently Asked Questions

Will a 2023 GMC transmission from another model fit my truck?
Only if the option code, drive configuration and engine all line up. A 2023 Sierra 1500 ten-speed and a 2023 Yukon ten-speed can be the same family and still be different part numbers once the drive layout and calibration are accounted for. Text us the VIN and we will confirm the exact match in writing.
Is a 2023 Sierra 1500 5.3L an eight-speed or a ten-speed?
Both exist. GM built the 5.3L half-ton with an 8L90 eight-speed on some configurations and a 10L80 ten-speed on others, which is why our listings carry the MHS and MHT option codes. Your VIN is the only reliable way to settle it, and we will check it for you before you order.
What transmission is behind a 2023 Sierra 2500 HD?
An Allison 10L1000 ten-speed, on both the gasoline 6.6L L8T and the 6.6L Duramax diesel — but they are not the same unit. The diesel listings carry option code MGM, and the Denali HD diesel is listed under engine ID OMEF. We match the donor VIN to your VIN to confirm which side you need.
Do you carry 2023 GMC Acadia and Terrain transmissions?
Yes. The Acadia runs a 9T65 nine-speed behind both the 2.0L turbo four and the 3.6L V6, and the Terrain a 9T45 or 9T50. We hold front-wheel-drive and all-wheel-drive builds for both models; tell us which you have, or send the VIN.
Which 2023 GMC is still on a six-speed?
The Savana. A 2023 Savana 2500 with the 6.6L L8T V8 uses the 6L90 six-speed, while the 4.3L V6 vans moved to the 8L90 eight-speed. The van line is the one place in the 2023 GMC range where a six-speed is still the correct part.
Do I get to see the actual unit before it ships?
Yes, always. Our technicians photograph the specific transmission from several angles and send those photos to you for approval before anything is palletized. If you do not approve, you pay nothing — no restocking fee and no return freight charge.
How much does freight cost, and how long does it take?
Freight is free to all fifty states. A transmission is strapped to a heavy-duty wooden pallet and moves by freight carrier; most deliveries land within three to seven business days of approval, and you get tracking as soon as it is on a truck.
What do you need from me to quote a 2023 GMC transmission?
The VIN is enough. It gives us the transmission code, the drive configuration and the build split in one step. Text it to +1-307-441-5554 or call 1-877-313-8995 and we will come back with the options we actually have on the shelf.
🏆 Earn $500 with Our Rewards Program
Every GMC transmission 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 2023 GMC transmission we ship has been through these six steps:

1. VIN-Matching
We match the donor VIN to your VIN to confirm transmission code, drivetrain, and 2WD/4WD configuration.
2. Tested & Verified
ASE-certified technicians Shift-Test every gear under load. Units are checked for clean engagement, no slipping, no abnormal noises.
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: bell housing, output shaft, solenoid pack, cooler lines, 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 transmission 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 48 2023 GMC transmissions below.

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