6-Speed Automatic Transmission Assembly for 2015-2020 Chevrolet & GMC
Product Notes Read before buying
This is a 6-speed automatic transmission (GM RPO code MYB or 6L50) for 2.5L 4-cylinder engines in Rear-Wheel Drive (RWD/4x2) models ONLY. It will NOT fit 4WD/4x4 models, or vehicles with the 3.6L V6 or 2.8L Diesel engines.
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 |
|---|---|---|---|---|
| LT | Crew Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| LT | Extended Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| WT | Crew Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| WT | Extended Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| Z71 | Crew Cab Pickup | 2015 - 2019 | L4 2.5L | RWD | Automatic |
| Z71 | Extended Cab Pickup | 2015 - 2019 | L4 2.5L | RWD | Automatic |
| Base | Extended Cab Pickup | 2019 - 2020 | L4 2.5L | RWD | Automatic |
| 2016 - 2018 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Base | Crew Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| Base | Extended Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| SLE | Crew Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| SLE | Extended Cab Pickup | 2015 - 2020 | L4 2.5L | RWD | Automatic |
| SLT | Crew Cab Pickup | 2015 | L4 2.5L | RWD | Automatic |
| SLT | Extended Cab Pickup | 2015 | L4 2.5L | RWD | Automatic |
| SL | Extended Cab Pickup | 2019 - 2020 | L4 2.5L | RWD | Automatic |
| 2016 - 2018 |
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 RPO code 'MYB' on the SPID label (glove box for 2015-2017, or door jamb QR code for 2018-2020).
- Verify the 8th digit of the VIN is 'A' (2.5L LCV Ecotec engine).
- Confirm the vehicle is 4x2 (RWD) and does not have a front differential or transfer case.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- transmission jack
- torque converter holding tool
- professional-grade scan tool (J2534 pass-through / GM MDI with GDS2)
- fluid pump
- long extension bars and swivels
Budget for these consumables at install:
- Dexron VI or Mobil 1 Synthetic LV ATF HP fluid
- Transmission filter (ACDelco 24236933 or equivalent)
- Pan gasket
- Torque converter / front pump seal
- Extension housing rear output shaft seal
- Transmission cooler flush solvent
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific programming and TCM adaptive relearn
The internal TEHCM is VIN-locked to the donor vehicle. It must be reprogrammed with the recipient vehicle's VIN and latest GM calibration using a J2534 tool or GM MDI with GDS2. Alternatively, the original functioning TEHCM can be swapped into the replacement unit.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque converter must be fully seated (three distinct clicks/drops) before bolting transmission to engine to avoid cracking the front pump rotor.
- Mandatory transmission cooler and line flush to prevent debris from the failed unit contaminating the replacement.
- No dipstick: fluid level must be checked via a standpipe plug in the bottom of the pan at specific operating temperatures (86°F to 122°F) while the engine is running in Park.
- Exhaust Y-pipe runs directly under the pan and should be unbolted to prevent damage during removal/install.
Easy to get right once you know them:
- Ordering for the wrong engine (3.6L V6 or 2.8L Diesel) which have different bellhousing patterns and calibrations.
- Ordering for a 4x4 (AWD) truck when this is a 4x2 (RWD) unit with a different tailhousing.
- Skipping the VIN programming/flashing of the TEHCM, causing limp mode or communication codes.
- Reusing the old torque converter, which contaminates the new transmission with debris.
- Checking the fluid level with the engine off, leading to severe underfilling.
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: Complete fluid flush using updated Mobil 1 Synthetic LV ATF HP fluid. If unaddressed, replace torque converter.
🔎 Recommended at install: Update TCM software calibration, perform Service Fast Learn, or correct low fluid levels.
🔎 Recommended at install: Replace transmission cooler line quick-connect fittings or front pump seal.
🔎 Recommended at install: Reprogram TCM and ECM.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-05175-5484684). 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
2015-2020 Colorado & Canyon 6L50 Transmission: Problems, Identification, and Used Replacement
Identify the MYB 6L50 transmission, understand the torque converter shudder that kills it, and learn when to swap in a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
15 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: 19333276, 19419944, 24263814, 24279081
Other: 5BUA
Fits Years: 2015 2016 2017 2018 2019 2020
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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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