2008 Used GMC Transmissions For Sale

86
verified 2008 GMC transmissions
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2008 Used GMC Transmissions For Sale

Every 2008 GMC transmission we hold, sorted by the GM option code that actually decides fitment. 2008 is the year the gearbox stopped following the nameplate: the 4.3L and 4.8L Sierra 1500 and the 5.3L Yukon were still on four-speed 4L60E/4L65E hardware, the 6.2L Denali and Yukon XL moved to the six-speed 6L80, the heavy-duty 6.0L gas trucks took the 6L90, the 6.6L Duramax pickups took the Allison 1000, and the new Opt M99 Yukon Hybrid used a 2ML70 that shares nothing with any of them. Text us your VIN and we match the case ID, not the badge.

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2008 GMC Transmission Families

Which gearbox sits behind which 2008 GMC, and how many of each we hold today.

Transmission family Fits (2008) In stock
4L65E / 4L70E — Yukon & Yukon XL 1500 5.3L Yukon Exc. Denali (IDs CLD, LFD, AFM, KLD, KND, LND) and Yukon XL 1500 5.3L 12
Unit Confirmed by VIN — Acadia, Yukon XL, Sierra 6.0L Acadia FWD/AWD, Yukon XL 2500, Yukon XL 1500 6.0L, Sierra 1500 6.0L and the two unbadged Sierra listings — the titles name no unit, so the VIN settles it 10
4L80E (Opt MT1) — Savana 2500 / 3500 Gas Savana 2500 and 3500, 4.8L and 6.0L, 135" and 155" WB, case IDs MCP / MDP / MJP / MSP, plus the Opt MN8 gasoline 3500 9
4L60E / 4L65E — Sierra 1500 5.3L (Opt M30) Sierra 1500 5.3L four-speed, 4x2 IDs CJD / CLD / LFD / LJD and 4x4 IDs AFM / KCD / KLD / KND / LND 9
4L60E / 4L65E — Sierra 1500 4.8L (Opt M30) Sierra 1500 4.8L four-speed, 4x2 IDs CJD / CLD / LFD / LJD and 4x4 IDs AFM / KLD / KND / LND 8
Allison 1000 — 6.6L Duramax Heavy Duty Sierra 2500 HD and 3500 HD 6.6L Duramax, 4x2 and 4x4, Power Take Off and w/o PTO held apart 6
4L60E / 4L70E — Envoy Envoy 4.2L I6 on the 4L60E (IDs SAD, SWD, TAD, TWD) and the 5.3L V8 on the 4L70E, 4x2 and 4x4 6
4L60E — Canyon Automatic Canyon 2.9L and 3.7L automatic, 4x2 and 4x4 4
4L60E (Opt M30) — Savana 1500 / 2500 Light Duty Savana 1500 4.3L and 5.3L (RWD and AWD) plus the Savana 2500 4.3L V6 4
6L90 — 6.0L Vortec Gas Heavy Duty Sierra 2500 HD and 3500 HD 6.0L gasoline, 4x2 and 4x4 4
6L80 — Yukon Denali and Yukon XL 1500 6.2L Yukon Denali 4x2 and 4x4 plus Yukon XL 1500 6.2L — the only six-speed full-size SUV this year 4
4L80E (Opt MN8) — Savana 6.6L Duramax Diesel Savana 2500 and 3500 6.6L diesel, case IDs MKP (135" WB) and MLP (155" WB) — the listings name the 4L80E behind the Duramax 4
4L60E — Sierra 1500 4.3L V6 Sierra 1500 4.3L, 4x2 IDs CAD and LAD plus 4x4 3
Manual Transmission — Canyon 2.9L Canyon 2.9L manual, 4x2 and 4x4 — the listings name no unit 2
2ML70 — Yukon Two-Mode Hybrid (Opt M99) Yukon 4x4 with the Hybrid Option — an electrically variable unit, interchangeable with nothing else on this page 1
Total 86

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.

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Why Buy a 2008 GMC Transmission from Auto Power Source

2008 is the GMT900 half-ton's second season and the year GM shipped the widest spread of automatics it ever put behind one brand's line-up. The 4.3L V6 and 4.8L V8 Sierra 1500 sat on four-speed 4L60E hardware, the 5.3L carried 4L60E/4L65E cases identified only by a three-letter build ID in the listing, the 6.2L Denali and Yukon XL 1500 ran the six-speed 6L80, the 6.0L Vortec heavy duty took the 6L90, the 6.6L Duramax pickups took the Allison 1000, and the Savana vans split between the 4L60E on the light duty and the 4L80E on Opt MT1 and Opt MN8. Six distinct families, one model year.

That is why every unit on this page is listed by its option code and case ID rather than by the truck it came out of. A 2008 Sierra 1500 5.3L listing reading ID KND is not interchangeable with one reading ID CJD even though both trucks look identical in the driveway, and the 2008 Yukon splits three ways — Exc. Denali four-speed, Denali 6L80, and Opt M99 two-mode hybrid — inside one nameplate.

Every transmission is a used OEM unit pulled from a low-mileage donor vehicle, cleaned, inspected by our ASE-certified technicians and checked against your VIN before it leaves the yard. Free freight to all 50 states, a 3-year warranty as standard, and a team that will tell you when a unit does not fit rather than shipping it and arguing later.

We match the donor VIN to your VIN on every order, so the option code, case ID, drive layout and final drive all line up before anything is crated. If the listing is ambiguous — and on 2008 GMC a handful genuinely are — we say so on this page instead of guessing, and we confirm the unit off your VIN before you pay.

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

Your 2008 GMC Transmission Options: Compared

Most 2008 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.

2008 GMC Transmission Buying Guide

5 things to verify before buying a used 2008 GMC transmission:

  1. Read the option code, not the badge. On a 2008 GMC the RPO code is the hardware. Opt M30 means the four-speed 4L60E/4L65E, Opt MYC the six-speed 6L80, Opt MT1 and Opt MN8 the 4L80E in the Savana, and Opt M99 the two-mode hybrid. Two trucks with the same engine and different codes do not share a gearbox.
  2. Check the three-letter case ID. The 2008 Sierra 1500, Yukon and Yukon XL 1500 listings carry IDs like CJD, CLD, LFD, LJD, AFM, KCD, KLD, KND and LND. Those identify the specific case and valve body, and they are the single most reliable field on a 2008 half-ton listing.
  3. Separate the heavy duty from the half-ton. The 6.0L Vortec Sierra 2500 HD and 3500 HD run the 6L90, and the 6.6L Duramax runs the Allison 1000 — neither bolts to a half-ton. On the 3500 HD, Power Take Off and w/o PTO are different units and we list them apart.
  4. Treat the Opt M99 Yukon as its own species. 2008 is the first year of the two-mode hybrid Yukon. The 2ML70 is an electrically variable transmission with its own controls and cooling, and it interchanges with nothing else on this page. If your Yukon carries the Hybrid Option, only a 2ML70 will do.
  5. Confirm the match with your own VIN before you order. Text or call us with your VIN and we will confirm the option code, case ID, drive layout and final drive against the exact unit before anything ships. It takes a few minutes and it is the only way to be certain on a year this fragmented.

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

📞 Need help choosing the right 2008 GMC transmission? Talk to our team live.Call 1-877-313-8995

Frequently Asked Questions

How many 2008 GMC transmissions do you have in stock?
We currently hold 86 tested 2008 GMC transmissions across 15 unit families — Sierra 1500 and Sierra HD, Yukon and Yukon XL, Savana, Canyon, Envoy and Acadia. The count on this page is live active stock, not a catalogue figure.
Why do two identical 2008 Sierra 1500 trucks need different transmissions?
Because 2008 GMC identifies the gearbox by RPO option code and case ID, not by engine or trim. The 4.3L and 4.8L Sierra 1500 is four-speed 4L60E, the 5.3L carries 4L60E/4L65E cases split by build ID, and the 6.2L sits on the 6L80. The ID letters in the title are what match your truck.
What transmission is in a 2008 Yukon?
Three different ones. The Exc. Denali Yukon runs the four-speed 4L65E/4L70E with case IDs CLD, LFD, AFM, KLD, KND and LND. The Denali runs the six-speed 6L80. The Opt M99 Hybrid runs a 2ML70 two-mode unit that shares no parts with either.
Is the 6.6L Duramax transmission the same in the 2500 HD and the 3500 HD?
Both are the Allison 1000, but the 3500 HD splits further: units built for Power Take Off are not the same as w/o PTO units, and we list them apart. Send the VIN and we will confirm which side your truck is on.
What is in the 2008 Savana van?
The Savana 1500 and the 4.3L Savana 2500 use the 4L60E on Opt M30. Everything heavier uses the 4L80E — Opt MT1 behind the 4.8L and 6.0L gas engines (IDs MCP, MDP, MJP, MSP, split by wheelbase) and Opt MN8 behind the 6.6L diesel (IDs MKP, MLP).
Some of your 2008 listings say the unit is confirmed by VIN. Why?
Because a few 2008 GMC titles carry no engine and no option code — the Acadia, the Yukon XL 2500, the 6.0L Yukon XL 1500 and Sierra 1500, and two unbadged Sierra listings. GM used more than one automatic there, so rather than assert a unit we have not verified, we confirm it off your VIN.
Do you ship a 2008 GMC transmission with a warranty?
Yes. Every unit carries a 3-year warranty as standard and ships free to all 50 states. Our ASE-certified technicians inspect each transmission and verify the option code and case ID against your VIN before it is crated.
How fast can you tell me which unit fits my 2008 GMC?
Usually within minutes. Text your VIN to +1-307-441-5554 or call 1-877-313-8995 and we will come back with the matching option code, case ID and price. Or email info@autopowersource.com.
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100K+
Engines+Transmissions In Stock
0%
fitment-related returns
All 50
states covered, free freight
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brands covered

Our 6-Step Inspection & Shipping Process

Every 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 86 2008 GMC transmissions below.

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