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Remanufactured 6L80 Transmission Overview

This is a remanufactured Hydra Matic 6L80 six speed automatic transmission built for the 2011 Chevrolet Silverado 1500 with the 5.3L gas V8 and 4X4 drivetrain. Carrying RPO code MYC, this is the longitudinal six speed GM engineered for rear and rear biased all wheel drive trucks. It arrives ready to install with the bell housing and a fully remanufactured, tested torque converter included, so you drop in a complete unit.

The 6L80 belongs to GM's 6LXX family that succeeded the older 5LXX four and five speed units, using direct clutch to clutch shifting with no bands at all. First introduced in 2005 and built at Willow Run and Toledo, it uses added gearing to keep your 5.3L V8 in its power band longer, improving fuel economy by roughly 4 to 7 percent over the previous four speed automatics while delivering smooth, electronically controlled shifts.

Fitment, Specs, And Design

This 6L80 fits 2011 Chevrolet Silverado 1500 trucks running the 5.3L gas V8 in 4X4 configuration. The same MYC six speed covers nearly all 2011 Silverado 1500 4X4 builds, and the core 6L80 family spans model years 2007 through 2013. Known OEM assembly and tag numbers include 1CKA, 19328889, 24245017, and 19256837, which help confirm you have the right unit.

The design uses a cast aluminum alloy case measuring 23.5 inches with a dry weight near 195 pounds. Gear ratios run a steep 4.030 first down to a tall 0.670 sixth overdrive, giving a wide 6.04:1 spread that pairs low rpm highway cruising with strong launch. Reverse is 3.060, and the unit includes two overdrive gears plus a locking torque converter for efficiency.

Internally the 6L80 relies on a TEHCM mounted inside the pan that combines the transmission control module, solenoids, and pressure switches into one serviceable assembly. That 32-bit module monitors performance and compensates for normal clutch plate wear, so shift quality stays consistent across the life of the unit. The control electronics also learn your driving habits and adjust shift patterns for a personalized feel behind the wheel.

How This Unit Is Remanufactured

Every unit goes through a full remanufacturing process, not a quick cleanup. The fluid pump is resurfaced, and we install a late style stator support shaft with updated seal rings. Bushings and machined surfaces are polished to an OE grade mirror finish of 15 RA or less, ensuring tight clearances and clean hydraulic flow throughout the rebuilt assembly.

To eliminate the common weak points, the build includes an upgraded OE 38-element low sprag, boost sleeves, and an oversized pressure regulator valve for stable line pressure. A Tru Flat qualification process is applied to the case, valve body, pump, and channel plate, preventing the cross leaks and pressure losses that cause slipping and erratic shifting in high mileage cores.

The torque converter is fully remanufactured and tested, directly targeting the converter shudder that owners describe as a rumble strip vibration under light acceleration. Finally, each transmission receives 100 percent dyno testing before it ships, so the shift quality, pressures, and engagement are verified under load rather than assumed. You receive a unit proven to perform before it leaves our floor.

Before you order, confirm the fitment details that matter on this platform. Verify your truck is a 2011 Silverado 1500 with the 5.3L gas V8 and 4X4 drivetrain, since that combination is what this 6L80 is built for. Check your original transmission's RPO code for MYC on the glovebox or door jamb label, and compare your existing assembly or tag number against the known numbers such as 1CKA, 19328889, 24245017, or 19256837. Matching these ensures the correct internal calibration and torque converter pilot for your application.

This unit accepts either the 258mm or 300mm torque converter and is validated for a maximum gross vehicle weight of 8,600 pounds, with a 439 lb ft maximum engine torque input and shift speeds up to 6,500 rpm. If your truck tows heavily, those limits matter. One critical install note: the TEHCM must be reprogrammed or have the original file restored and matched to your vehicle's VIN and transmission serial number, or the truck may not shift correctly, throw codes, or drop into limp mode.

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Why Houston Drivers Replace This Transmission

The 6L80 is one of GM's most widely used gearboxes, bridging the gap between the older 4L series and the heavy duty Allison units. The Silverado 1500 is also one of the most searched trucks for transmission trouble, so a proven reman unit is the smart path back to dependable daily driving.

Torque converter shudder is the number one complaint on these units, felt as a vibration or rumble strip sensation during light acceleration. Early 6L80 builds also suffered a weak 3 to 5-R wave plate that cracks and contaminates the unit with clutch material, typically causing loss of third, fifth, and reverse gears.

Other failures driving replacement include failing electro hydraulic solenoids and leaking valve body separator plates that trigger erratic shifts, slipping, or codes like P0776. Delayed engagement from pump wear or worn clutch packs, plus fluid leaks at the pan gasket, cooler lines, or front seal, round out the usual reasons owners rebuild or replace.

Here in Houston, heat and workload make these failures worse. The 6L80 lives in trucks that tow and haul, and heavy loads, oversized tires, and relentless high temperatures push the transmission into the danger zone faster than in milder climates. If you are pulling trailers across Harris County summers, your original unit works harder and runs hotter than the design comfort band, which is exactly why so many local Silverado owners end up needing a replacement sooner than expected.

GM acknowledged several of these issues through technical service bulletins. TSB PI488C addresses no forward or reverse and slipping on 2010 to 2014 models including the Silverado, Avalanche, and related GMC and Cadillac platforms. TSB 09 to 07 to 30 to 004J covers slips in reverse or third, delayed reverse or drive engagement, harsh 2 to 3 shifts, and codes P0776, P2715, and P2723. A remanufactured unit addresses these known weak points instead of patching a failing core.

Installation And Fluid Guidance

This transmission ships with the bell housing and a remanufactured torque converter installed, but the flexplate, radiator, external transmission cooler, and fluid are not included. Plan to supply DEXRON VI fluid only, which is the correct specification for the 6L80. A pan and filter level fill takes roughly 6 quarts, while a dry install runs closer to 10.5 quarts, with complete system capacity including the cooler near 12.2 quarts depending on configuration.

Set your final fluid level by the indicator with the transmission at operating temperature between 160 and 200 degrees, never cold. We strongly recommend replacing the transmission oil cooler and installing a thermostatic bypass to eliminate the high failure point of the OEM cooler lines. In Houston heat, controlling fluid temperature is one of the best things you can do to protect a freshly installed unit and extend its service life.

Follow GM torque values during the swap for a clean install. On light duty variants, crossmember 21mm nuts torque to 70 lb ft, transfer case nuts to 37 lb ft, and strap bolts to 18 lb ft. Remember the TEHCM reprogramming step must be completed so the module matches your VIN and transmission serial number, which protects the adaptive learning and keeps shift patterns correct from the first mile you drive.

Frequently Asked Questions

Will this 6L80 fit my 2011 Silverado 1500?

Yes, provided your truck is a 2011 Chevrolet Silverado 1500 with the 5.3L gas V8 and 4X4 drivetrain. This is the MYC coded 6L80 six speed. Confirm your RPO code and compare your assembly tag number against the known OEM numbers to be certain.

Does the transmission need to be programmed after installation?

Yes. The 6L80 uses a TEHCM that combines the control module and valve body electronics. It must be reprogrammed or have the original file restored and matched to your vehicle's VIN and transmission serial number, or the truck may shift erratically, set codes, or enter limp mode.

What's included with this remanufactured unit?

The bell housing and a fully remanufactured, dyno tested torque converter are included. The flexplate, radiator, external transmission cooler, and transmission fluid are not included. You will need to supply DEXRON VI fluid and plan for a transmission oil cooler replacement during installation.

What fluid does the 6L80 use and how much?

The 6L80 requires DEXRON VI fluid only. A pan and filter service takes about 6 quarts, a dry install needs roughly 10.5 quarts, and total system capacity including the cooler is near 12.2 quarts. Always set the final level by the indicator at 160 to 200 degrees.

What years and vehicles share this transmission?

The 6L80 in the 2011 Silverado 1500 4X4 5.3L is part of a family used from 2007 through 2013. It appears across many rear and rear biased all wheel drive GM trucks and SUVs with a longitudinal powertrain, but always verify RPO code and tag numbers before ordering.

Why does the 6L80 get torque converter shudder?

Converter shudder is the most common 6L80 complaint, felt as a vibration or rumble strip sensation during light acceleration. It is often tied to converter clutch and fluid condition. Our remanufactured unit ships with a rebuilt, tested torque converter and should be filled with fresh DEXRON VI to address it.

Is this transmission tested before it ships?

Yes. Every unit receives 100 percent dyno testing, so engagement, pressures, and shift quality are verified under load before shipment. The build also includes a Tru Flat qualification of the case, valve body, pump, and channel plate to prevent cross leaks and pressure losses.

Can this 6L80 handle towing?

The 6L80 is validated to 8,600 pounds gross vehicle weight with a 439 lb ft maximum engine torque input. It handles typical half ton towing, but heavy loads and Houston heat raise fluid temperature. Installing a new cooler and thermostatic bypass is strongly recommended to protect the unit when you tow.

What problems does a reman unit solve over a used core?

A remanufactured unit addresses the known weak points, including the fragile 3 to 5-R wave plate, worn sprag, pump wear, and solenoid or separator plate leaks that cause codes like P0776. Upgraded internals, resurfaced surfaces, and dyno testing deliver far more reliable service than an untested salvage transmission.

What torque specs apply during installation?

On light duty variants, crossmember 21mm nuts torque to 70 lb ft, transfer case nuts to 37 lb ft, and strap bolts to 18 lb ft. Complete the TEHCM reprogramming step as well so the module matches your VIN and serial number for correct shift patterns.