6-Speed Automatic Transmission Assembly for 2019-2022 Chevrolet & GMC
Product Notes Read before buying
This is a 6-speed automatic transmission (RPO code MYC) for 4-wheel drive models with the 5.3L V8 engine. For 2019 pickup models, this fits the 'new style' body where the mirrors mount on the door skin. For 2022 Silverado 1500, this ONLY fits the 'Classic' or 'Limited' models (the carryover body style).
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 |
|---|---|---|---|---|
| Custom | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| Custom | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Custom Trail Boss | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| Custom Trail Boss | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| High Country | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| LT | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| LT | Extended Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| LT Trail Boss | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| LTZ | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| LTZ | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| RST | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| RST | Extended Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| SSV | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| SSV | Crew Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| WT | Crew Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| WT | Crew Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| WT | Extended Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| WT | Extended Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| WT | Standard Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| WT | Standard Cab Pickup | 2019 - 2022 | V8 5.3L | 4WD | Automatic |
| Custom | Crew Cab Pickup | 2020 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Custom | Extended Cab Pickup | 2020 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Custom Trail Boss | Crew Cab Pickup | 2020 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Custom Trail Boss | Extended Cab Pickup | 2020 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| AT4 | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| AT4 | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Base | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Base | Crew Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Base | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Base | Extended Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Base | Standard Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Base | Standard Cab Pickup | 2019 - 2021 | V8 5.3L FLEX | 4WD | Automatic |
| Denali | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Elevation | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| Elevation | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| SLE | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| SLE | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| SLT | Crew Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| SLT | Extended Cab Pickup | 2019 - 2021 | V8 5.3L | 4WD | Automatic |
| 2020 |
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 the 5th digit of the VIN is W or Y and the engine is a 5.3L V8.
- Check the Service Parts Identification label in the glovebox or door jamb for RPO code MYC.
- Confirm the vehicle is a 4x4 model with a front driveshaft and transfer case.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Heavy-duty transmission jack
- Torque converter holding/alignment tool
- J2534 pass-thru programming device (GM MDI2 or equivalent)
- Professional scan tool capable of performing a Transmission Fast Learn
- Fluid pump for refilling
Budget for these consumables at install:
- GM-approved Dexron VI automatic transmission fluid (or Mobil 1 Synthetic LV ATF HP per TSB 18-NA-355)
- Transmission filter and pan gasket
- Torque converter input seal (front pump seal)
- Updated GM low-temperature thermal bypass valve (Part #85585333)
- Professional transmission cooler line flush solvent / hot flush
- Transfer case input and output seals
What your vehicle’s computers will need after the swap:
What’s involved: VIN-Specific Programming & TCM Adaptive Relearn (Fast Learn)
The internal TEHCM is VIN-locked. A technician must use a J2534 pass-thru device with GM's SPS2 / Techline Connect software to overwrite the donor VIN with the target vehicle's VIN. A Transmission Fast Learn adaptive reset must then be performed to calibrate the solenoids.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must click and drop down three distinct times to fully engage the pump gears. Failure to seat fully will crack the front pump gear upon bolting to the engine.
- Bypassing the Thermostat for Flushing: The thermal bypass valve blocks fluid flow to the cooler when cold. You must temporarily remove or bypass the thermostat during flushing to clear out debris.
- Fluid Level Check Procedure: No dipstick is present. Fluid level must be checked via the bottom pan plug with the engine running and fluid temperature strictly between 86°F and 122°F (30°C to 50°C).
Easy to get right once you know them:
- Skipping the VIN Programming: Assuming the unit is plug-and-play, resulting in a no-start security condition or single-gear limp mode.
- Reusing the Old Torque Converter: Reintroducing trapped metal debris from the failed transmission into the replacement unit.
- Failing to Flush the Cooler Lines: Allowing old debris to contaminate the replacement unit's sensitive solenoids and pressure switches.
- Forcing the Bellhousing Bolts: Using bolts to pull the transmission flush to the engine when the torque converter is not fully seated, cracking the pump.
- Ignoring the Thermal Bypass Valve Upgrade: Reusing the original 194°F thermostat, leading to fluid degradation and premature failure.
- Buying the Wrong Drivetrain Version: Ordering a 4WD transmission for a 2WD truck or vice-versa.
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: Flush transmission with specific fluid exchange machine and refill with Mobil 1 Synthetic LV ATF HP fluid (TSB 18-NA-355). If severe, replace the torque converter and flush the entire cooling system.
🔎 Recommended at install: Install updated GM low-temperature thermal bypass valve (Part #85585333) which opens at 158°F (70°C) instead of the original 194°F.
🔎 Recommended at install: Replace internal pressure switch membranes or complete TEHCM assembly. Diagnosed via DTCs P0877, P2715, P0796, or P0777.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-10697-5581317). 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
2019-2022 Silverado & Sierra 1500 6L80 (MYC) 4x4 Transmission: Problems, Identification, and Used Replacement
Identify the MYC 6-speed automatic, understand the torque converter and thermal bypass failures that kill it, and learn when to swap in a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
38 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:
GMC: 19431548, 24284620
Other: 9CKA
Fits Years: 2019 2020 2021 2022
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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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