6-Speed Automatic Transmission Assembly for 2011 Buick, Chevrolet, & GMC - Front
Product Notes Read before buying
This is a 6-speed, front-wheel-drive (FWD) automatic transmission. It will NOT fit all-wheel-drive (AWD) models. Fitment is specific to the engine: it fits LaCrosse models with the 3.6L V6, and Equinox, Terrain, and SRX models with the 3.0L V6. Please verify your vehicle has the transmission option code MH2.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| CX | Sedan | 2011 | V6 3.6L | FWD | Automatic |
| CXL | Sedan | 2011 | V6 3.6L | FWD | Automatic |
| CXS | Sedan | 2011 | V6 3.6L | FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LT | SUV | 2011 | V6 3.0L FLEX | FWD | Automatic |
| LTZ | SUV | 2011 | V6 3.0L FLEX | FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| SLE | SUV | 2011 | V6 3.0L FLEX | FWD | Automatic |
| SLT | SUV | 2011 | V6 3.0L FLEX | FWD | Automatic |
| SLT | SUV | 2011 | V6 3.0L | FWD | Automatic |
Know This Transmission Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this transmission family:
A quick look at your own vehicle makes sure the right transmission shows up:
- Verify the 8th digit of the VIN is C, D, or 5.
- Locate the Service Parts Identification sticker and confirm RPO code MH2.
- Confirm the vehicle is Front-Wheel Drive (FWD) only.
- Locate the transmission barcode tag and verify broadcast code 1ABK and GM part number 24249594.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bar
- Transmission jack with secure adapter
- Professional-grade OBD-II scan tool with GM SPS capability
Budget for these consumables at install:
- GM DEXRON-VI Full Synthetic Automatic Transmission Fluid (9.0 to 9.5 quarts total capacity)
- Torque converter hub seal (front pump seal)
- Left and right axle shaft seals (differential seals)
- Side cover gasket (if swapping TEHCM)
- Transmission filter and pan gasket (if splitting case/servicing pan)
- Transmission cooler line flush or replacement cooler
What your vehicle’s computers will need after the swap:
What’s involved: VIN-Specific Flash Programming and TCM Adaptive Relearn
The internal TEHCM must be programmed to the vehicle's VIN using GM's Service Programming System (SPS) or TIS2Web. Alternatively, swap the original TEHCM if functional, followed by a TCM Adaptive Fast Learn.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Ensure the converter is fully seated (three distinct drops/clicks) before bolting to the engine to avoid crushing the front pump gear.
- Subframe Alignment: Ensure the front subframe is perfectly aligned to body dowel pins during reinstallation to prevent steering/alignment issues.
- TCM Connector Protection: Protect the fragile 20-pin connector from bent or cracked pins.
- Fluid Level Check Procedure: Check fluid level with engine idling in Park, fluid temp at 180-200°F (or 86-122°F per Arm 2), and level check plug removed.
Easy to get right once you know them:
- Reusing a contaminated transmission cooler without a professional hot flush or replacement.
- Forcing the bellhousing bolts to pull the transmission and engine together when the torque converter is not fully seated.
- Skipping the TEHCM VIN programming and expecting the vehicle to drive immediately without entering limp mode.
- Using generic multi-vehicle ATF instead of licensed DEXRON-VI.
- Reusing old axle seals leading to post-install leaks.
Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace wave plate with updated design. GM Special Coverage Adjustment 14404A/14404B (expired).
🔎 Recommended at install: Replace laminated rubber discs on fluid pressure switches inside TEHCM or replace TEHCM.
🔎 Recommended at install: Perform fluid flush with fresh DEXRON-VI or replace torque converter.
🔎 Recommended at install: Sleeve or repair accumulator bores in the channel plate.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-01359-1809882). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2011 Equinox, Terrain & LaCrosse 6T70 Transmission: Problems, Identification, and Used Replacement
Identify the FWD MH2 6T70 transmission, understand the fatal 3-5-Reverse wave plate failure, and learn when to swap in a used OEM replacement unit.
Read Full Guide →Related Trouble Codes (OBD-II)
32 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
GM: 24249397, 24249594
Other: 1ABK
Fits Years: 2011
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This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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