6-Speed Automatic Transmission Assembly for 2021-2022 Chevrolet & GMC
Product Notes Read before buying
This is a 6-speed automatic transmission (GM option code MYB) for 2.5L RWD (4x2) models only. It will not fit 4x4 models or vehicles with a different engine.
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 | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| LT | Extended Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| WT | Crew Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| WT | Extended Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Elevation | Crew Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| Elevation | Extended Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| Elevation Standard | Crew Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | Automatic |
| Elevation Standard | Extended Cab Pickup | 2021 - 2022 | L4 2.5L | RWD | 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 'A' (2.5L LCV engine).
- Verify the vehicle is 4x2 (Rear-Wheel Drive) with no transfer case.
- Verify RPO codes 'MYB' and 'LCV' on the Service Parts Identification sticker in the glove box.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Transmission jack
- Engine support fixture or heavy-duty jack stands
- Torque converter clutch alignment/holding tool
- GM-compatible scan tool with GDS2/SPS2 capability
- Transmission cooler line flush kit
- Long socket extension
Budget for these consumables at install:
- Full Synthetic DEXRON-VI or Mobil 1 Synthetic LV ATF HP fluid
- Transmission filter and pan gasket kit
- Torque converter input shaft seal
- Transmission cooler line flush solvent
- Engine rear main seal (recommended)
What your vehicle’s computers will need after the swap:
What’s involved: VIN programming and Service Fast Learn adaptive relearn
The internal TEHCM is VIN-locked. You must either program the donor TEHCM with the vehicle's VIN using GM SPS2 or swap your original TEHCM onto the replacement unit. A Service Fast Learn adaptive relearn is mandatory in both cases.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Ensure the converter is fully seated in three distinct stages before bolting to the engine to avoid cracking the front pump.
- No-Dipstick Fluid Fill: Fluid level must be checked via the check plug on the bottom of the pan with the vehicle level, engine running, and fluid temperature between 86°F and 122°F.
- Cooler Line Flushing: Solenoids are highly sensitive to debris. Cooler lines must be thoroughly flushed or replaced if the previous transmission failed mechanically.
- Service Fast Learn: Mandatory adaptive relearn procedure must be performed with a scan tool before driving to prevent immediate clutch damage.
Easy to get right once you know them:
- Buying for a 4x4 Truck: This is a 4x2 transmission and will not bolt to a transfer case.
- Engine Mismatch: Assuming all 6-speed transmissions are identical; this unit will not fit 3.6L V6 or 2.8L Diesel models.
- Skipping the Adaptive Relearn: Driving without performing the Service Fast Learn causes incorrect line pressures and immediate clutch burn-out.
- Reusing the Old Torque Converter: Reusing a contaminated converter will ruin the replacement transmission.
- Using the Wrong Fluid: Failing to use licensed DEXRON-VI or recommended synthetic fluid can cause shudder issues.
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 transmission fluid flush using Mobil 1 Synthetic LV ATF HP fluid (TSB PIP5342B / TSB 18-NA-355).
🔎 Recommended at install: Replace spacer plate and check balls.
🔎 Recommended at install: Repair rough finish on center support housing and replace seal.
🔎 Recommended at install: Regular fluid changes and maintenance.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-11579-5393505). 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 Canyon & Colorado 2.5L 4x4 6L50 Transmission: Problems, Identification, and Used Replacement
Identify the MYB 6-speed automatic, understand the infamous GM shudder, and learn when to swap in a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
9 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: 24291518
Fits Years: 2021 2022
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Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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