6T40 Automatic Transmission Assembly for 2013-2014 Buick & Chevrolet
Product Notes Read before buying
This is an All-Wheel Drive (AWD) transmission for vehicles with the 1.4L engine. It will not fit Front-Wheel Drive (FWD) models.
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 |
|---|---|---|---|---|
| Base | SUV | 2013 - 2014 | L4 1.4L Turbo | AWD | Automatic |
| Convenience | SUV | 2013 - 2014 | L4 1.4L Turbo | AWD | Automatic |
| Leather | SUV | 2013 - 2014 | L4 1.4L Turbo | AWD | Automatic |
| Premium | SUV | 2013 - 2014 | L4 1.4L Turbo | AWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LT | SUV | 2013 - 2014 | L4 1.4L Turbo | AWD | Automatic |
| LTZ | SUV | 2013 - 2014 | L4 1.4L Turbo | 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:
- Confirm the 8th digit of the VIN is 'B' (1.4L Turbo engine).
- Confirm the vehicle is All-Wheel Drive (AWD) by checking for a rear driveshaft and differential.
- Verify the silver Service Parts Identification (SPID) sticker in the glove box or spare tire well lists codes 'MHB' and 'F46'.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support fixture
- Transmission jack
- Torque converter holding strap
- GM-compatible bidirectional scan tool
Budget for these consumables at install:
- Dexron VI synthetic automatic transmission fluid
- Transmission filter (internal, only replaceable by splitting case)
- Torque converter hub seal (front pump seal)
- Left and right axle seals
- PTU (transfer case) input/output shaft seals and O-rings
- Cooler line flush (e.g., Lubegard Kooler Kleen)
What your vehicle’s computers will need after the swap:
What’s involved: VIN-Specific Programming and TCM Adaptive Relearn (Fast Learn)
If reusing original TEHCM, a 'Transmission Adaptive Values Learn' (Fast Learn) is required. If using the replacement TEHCM, it must be programmed with the vehicle's exact VIN using GM's Service Programming System (SPS) via a J2534 pass-through tool or dealer scan tool.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque converter must be fully seated (three distinct drops/clicks) before bolting to the engine to avoid cracking the oil pump.
- PTU (transfer case) alignment must be clean, greased, and aligned carefully to avoid tearing intermediate shaft seals.
- No dipstick fluid fill procedure requires warming fluid to 185-203°F (or 147-169°F depending on model year) to open the thermal standpipe before checking the side level plug with the engine running.
- TCM Adaptive Relearn (Fast Learn) must be performed to prevent immediate slipping and clutch damage.
- Ensure alignment dowel pins are present on the engine block before mating the transmission.
Easy to get right once you know them:
- Ordering a FWD unit (MH8) for an AWD vehicle (MHB).
- Skipping the transmission cooler line flush, leading to immediate contamination of the replacement unit.
- Checking the fluid level with the engine off, which results in a severe underfill.
- Forcing the bellhousing bolts to pull the transmission and engine together when the torque converter is not fully seated.
- Failing to program the replacement TEHCM to the vehicle's VIN, causing limp mode and harsh shifting.
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 damaged transmission fluid pump causing low or no line pressure.
🔎 Recommended at install: Replace internal snap ring to prevent it from popping out of its retaining groove and causing limp mode.
🔎 Recommended at install: Replace worn case bushing and driver's side axle seal.
🔎 Recommended at install: Address worn pressure regulator valve bores and clogged/failed TEHCM solenoids.
🔎 Recommended at install: Secure or replace transmission shift cable adjuster to prevent roll-away.
🔎 Recommended at install: Ensure precise fluid level setting to prevent fluid expansion and overheating.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-04894-2451020). 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
2016-2017 Buick Verano 6T40 / 6T45 Transmission: Problems, Identification, and Used Replacement
Identify the exact MH8 or MH7 unit for your 2.4L Verano, understand common TEHCM and torque converter failures, and learn what to look for when buying a used replacement assembly.
Read Full Guide →Related Trouble Codes (OBD-II)
8 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:
Buick: 24266721, 24266721,3HKW
Other: 3HKW
Fits Years: 2013 2014
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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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