Transmission Assembly for 2011 Chevrolet & GMC • Equinox, Terrain
Product Notes Read before buying
This is a 6-speed automatic transmission for All-Wheel Drive (AWD) models equipped with the 2.4L 4-cylinder engine. Fitment is specific to vehicles with transmission option code MHC and ID code 1MDW. Please verify these codes on your vehicle's service parts identification label or original transmission before ordering.
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 |
|---|---|---|---|---|
| LS | SUV | 2011 | L4 2.4L | AWD | Automatic |
| LT | SUV | 2011 | L4 2.4L | AWD | Automatic |
| LTZ | SUV | 2011 | L4 2.4L | AWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| SLE | SUV | 2011 | L4 2.4L | AWD | Automatic |
| SLT | SUV | 2011 | L4 2.4L | AWD | 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 VIN 8th digit is C (confirms 2.4L 4-cylinder engine).
- Confirm vehicle is All-Wheel Drive (AWD) by checking for a rear driveshaft/differential.
- Check glove box Service Parts Identification sticker for RPO code MHC.
- Verify original transmission barcode label displays broadcast ID 1MDW.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Transverse engine support bar
- Transmission jack
- Subframe alignment pins
- GM-compatible scan tool (GM MDI with Tech2Win/SPS2, GM GDS 2, or equivalent)
Budget for these consumables at install:
- DEXRON-VI Automatic Transmission Fluid
- Torque converter hub seal (front pump seal)
- Left and right CV axle shaft seals
- Transfer case (PTU) input/output seals
- Side pan/valve body cover gasket (if swapping TEHCM)
- Professional transmission cooler-line flush aerosol/solvent
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific programming and TCM Adaptive Relearn (Fast Learn)
If reusing the original TEHCM, no VIN programming is required, but a TCM Adaptive Relearn (Fast Learn) is mandatory. If using the replacement TEHCM, it must be programmed with the vehicle's specific VIN using GM's Service Programming System (SPS2) or GDS 2.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must feel/hear three distinct drops/clicks. If not fully seated, bolting the transmission to the engine will crack the front pump rotor.
- Steering Column Lock: Lock steering wheel before dropping subframe to prevent destroying the airbag clockspring.
- Transfer Case (PTU) Spline Lubrication: Lubricate mating splines with high-pressure, water-resistant grease.
- No-Dipstick Fluid Level Check: Must check at operating temperature (185-203°F) with engine idling and vehicle level, using the oil level set plug (weep hole).
- No Serviceable Filter: The main filter is internal and cannot be replaced without splitting the case.
Easy to get right once you know them:
- Ordering a FWD transmission (RPO MH7) for an AWD vehicle (RPO MHC).
- Failing to program the TEHCM or perform the adaptive relearn.
- Skipping the mandatory transmission cooler-line flush.
- Checking fluid level with the engine off, leading to severe underfilling.
- Reusing worn axle and PTU seals.
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 the notched piston with the updated solid design (GM part #24259061) and install a new wave plate (GM part #24230757).
🔎 Recommended at install: Replace TEHCM or repair pressure switch laminate discs.
🔎 Recommended at install: Complete fluid flush or replacement of the upper/lower valve body housings.
🔎 Recommended at install: Repair defective electronic park lock lever.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-01391-5366552). 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 2.4L AWD 6T45 Transmission: Problems, Identification, and Used Replacement
Identify the exact MHC/1MDW transmission for your 2011 Equinox or Terrain, understand common wave plate and TEHCM failures, and learn when to replace it with a used OEM unit.
Read Full Guide →Related Trouble Codes (OBD-II)
26 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:
Chevrolet: 19331877, 24244674
Other: 1MDW
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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