Transmission Assembly for 2014-2017 Buick Regal
Product Notes Read before buying
Verify RPO code MH8 on your vehicle's service label. Fits 2.4L models with 3.23 gear ratio (opt F82).
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 | Sedan | 2014 | L4 2.4L MILD HYBRID EV-GAS (MHEV) | AWD/FWD | Automatic |
| Premium | Sedan | 2014 - 2016 | L4 2.4L MILD HYBRID EV-GAS (MHEV) | AWD/FWD | Automatic |
| Base | Sedan | 2015 - 2017 | L4 2.4L FLEX | AWD/FWD | Automatic |
| Base | Sedan | 2016 - 2017 | L4 2.4L | AWD/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:
- Confirm the 8th digit of the VIN (typically 'K' or 'R' for the 2.4L non-hybrid engine).
- Verify the Service Parts Identification label in the glove box or trunk contains RPO code MH8.
- Confirm the vehicle is Front-Wheel Drive (FWD) and not All-Wheel Drive (AWD).
- Verify the original transmission has the 4-letter broadcast code 4ARW or 5ARW, or matches GM part numbers 24269882 or 24269883.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Engine support bar / fixture
- Transmission jack
- GM-compatible scan tool (GDS2 / MDI) with J2534 pass-thru
- Torque wrench
- Axle seal installer (J-46629-A)
- Cooler line flush tool (DT-45096)
Budget for these consumables at install:
- DEXRON-VI synthetic automatic transmission fluid (approx. 4.2 to 6.3 quarts for service fill; 7.4 to 9.5 quarts for dry fill)
- Side cover gasket (control valve body cover gasket) if opened
- Front pump / torque converter seal
- Both CV axle shaft seals
- Transmission cooler line flush (aerosol kit or dedicated flushing machine)
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific programming (SPS2 flashing) and TCM adaptive relearn (Fast Learn)
The integrated TEHCM is locked to the donor vehicle's VIN. It must be programmed using a GM dealer-level scan tool (GDS2/MDI) or J2534 pass-thru tool, followed by a 'Transmission Service Fast Learn' adaptive calibration. The vehicle will not start or will remain in limp mode if this is not completed.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must make two distinct drops and sit about 1 inch back from the bellhousing face. Forcing the bellhousing bolts with an unseated converter will instantly crack the front pump gear.
- Dowel Pin Alignment: Ensure alignment dowel pins on the engine block are present and undamaged to prevent misalignment and rapid wear of the pump bushing or seals.
- TEHCM Programming Before Driving: Do not drive before programming; mismatched adaptive values can immediately burn up the clutch packs.
- Fluid Level Check Procedure: No dipstick. Must check via the check plug on the side of the case with the vehicle level, engine running, and fluid warmed to 85°C–95°C (185°F–203°F). Checking with the engine off causes a massive underfill.
- Axle Bushing Check: Check the driver's side case bushing for play before installing the CV axle; replace with an upgraded bushing if loose to prevent immediate seal leaks.
- Cooler Line Flush: Mandatory back-flush and forward-flush to clear metal debris from the previous failure, which will otherwise destroy the new TEHCM.
Easy to get right once you know them:
- Trying to drive the vehicle before programming the TEHCM, causing a no-start or immediate clutch damage.
- Forgetting or skipping the transmission cooler line flush, leading to contamination and premature failure of the replacement unit.
- Using the bellhousing bolts to pull the transmission tight to the engine block when the torque converter is not fully seated, cracking the front pump.
- Checking the fluid level with the engine turned off, resulting in a severe underfill of 2-3 quarts.
- Using universal or incorrect automatic transmission fluid instead of mandatory DEXRON-VI.
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: Transmission shift cable adjuster may disengage from the shift lever; requires inspection/repair of the cable adjuster.
🔎 Recommended at install: Improperly manufactured snap ring sticks to housing and pops out, causing limp mode (2nd and Reverse only); requires replacement of the snap ring.
🔎 Recommended at install: Launch shudder or harsh shifts caused by debris/scoring in valve bodies; requires cleaning or replacement of upper/lower valve bodies.
🔎 Recommended at install: Worn case bushing causes axle to wobble and tear the seal; replace seal and install upgraded Teflon-coated bushing (e.g., Superior K099 kit).
🔎 Recommended at install: Reprogram the Transmission Control Module (TCM) with a revised calibration.
🔎 Recommended at install: Perform a specific 'fast learn' or adaptive relearn procedure to allow the transmission to adapt.
🔎 Recommended at install: Causes shudder, slipping, and overheating; requires replacement of the torque converter and a complete system flush to remove debris.
🔎 Recommended at install: TEHCM fails due to heat/age, setting DTCs (e.g., P2714); requires replacement and programming of the TEHCM.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-05036-2272781). 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
2014-2017 Buick Regal 2.4L 6T40 Transmission: Problems, Identification, and Used Replacement
Identify the MH8 6-speed automatic, understand common TEHCM and torque converter failures, and learn when to install a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
5 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: 24269882, 24269883
GM: 24260631
Other: 4ARW, 5ARW
Fits Years: 2014 2015 2016 2017
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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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