We address the 6L80’s known wear points (3-5-R, 4-5-6, TCC apply) and match friction materials, clearances, hydraulics, and converter build to your vehicle’s weight, gearing, tires, and duty cycle—keeping temps stable and shift quality consistent.
RoadReady = stock power.
StreetMonster = towing/daily with mild tune.
SportMonster = heavier vehicles, steeper gears, or sticky tires.
TrackMonster = competition use & big power. If tuning/tires add load, step up one level.
Covers GM applications that use the 6L80/6L80E (RPO MYC) in RWD/4WD cars, trucks, and SUVs. Not for 6L90 (RPO MYD). Verify 2WD/4WD tailhousing/output, case length, and TEHCM year. A Full Reprogramming is required after install.
TEHCM & electronics? Units are built with year-correct solenoids and TEHCM configuration. Perform a full reprogramming after install. See Installation Instructions for details.
Converter included? Yes—each package includes a matched lockup converter (multi-disc options on Sport/Track).
Cooler flush? Always flush/replace cooler & lines to protect the new unit and warranty.
Warranty? Monster coverage as listed above; Extend continues after the Monster term—up to 6 years total on transmissions.
*HP/torque ratings are guidelines; vehicle weight, tires, gearing, and tuning affect capacity. When in doubt, step up a level.
Daily stock → RoadReady. Mild bolt-ons/towing → StreetMonster. Built street/track → SportMonster. Competition or 700+ HP → TrackMonster.
Yes—every package includes a matched lockup converter (multi-disc options on Sport/Track).
Units ship with year-correct solenoids & TEHCM configuration. Perform a full reprogramming after install.
Coverage is listed per tier; extendable up to a total of 6 years on transmissions.
*HP figures are guidance; vehicle weight, tires, gearing and tuning affect capacity.
Jump to: 3-5-R / 4-5-6 clutch strategy • TCC/PWM & converter setup • Cooling path & pans • Install checklist • Programming & adaptive learn
The 6L80E’s 3-5-R and 4-5-6 elements are sensitive to heat and apply timing. Our Street/Sport/Track tiers increase clutch capacity, revise clearances and hydraulics, and pair the package to vehicle weight, gears, and tire load so it holds apply pressure without flare.
PWM lockup and heavy loads can overheat the TCC. We supply a matched lockup converter (multi-disc on upper tiers) to reduce slip and improve lockup control—keeping temps stable in tow/track scenarios.
Run fresh DEXRON-VI, confirm cooler return flow, and consider a low-restriction auxiliary cooler. A deep aluminum pan adds capacity and improves heat rejection during long grades or hot weather.
Perform a full reprogramming (TCM/TEHCM) appropriate to your year/build, then run a light-throttle adaptive drive cycle—progressive upshifts and gentle coastdowns—to seat adaptives and protect fresh clutches.
6L80 (RPO MYC) differs from 6L90 (RPO MYD) in internal capacity and hard-part dimensions. Verify before ordering.
Yes. A full reprogramming is required after install. Then perform an adaptive learn drive cycle.
Yes—each package includes a matched lockup converter (multi-disc options on Sport/Track).
DEXRON-VI. Capacity varies with pan/converter; verify at temp using the correct procedure.
Order the correct output/tailhousing configuration. If changing transfer case/gearing, tell us—we’ll match the package.
Drop temps and protect 3-5-R / 4-5-6 under load.
CoolingExtra capacity + better heat rejection for towing/track.
CapacityStart fresh after install and set level properly at temp.
FluidYear-correct electronics; reprogramming required after install.
ElectronicsIn stock form, the 6L80/6L80E is a solid 6-speed for trucks and SUVs—but it’s also known to be heat-sensitive under towing, big tires, heavy vehicles, or aggressive tuning. Most “bad 6L80” stories are really converter slip + heat that leads to clutch damage over time.
Most “6L80 rebuild kits” are seals + frictions (and maybe steels). The torque converter is often sold separately—and that’s where a lot of failures start (slip = heat).
“4x4 / 4WD” on a 6L80E usually comes down to the output/tailhousing setup to mate to your transfer case. The internals can be similar, but the fitment must match your truck.
It depends on whether you have a Sierra/Silverado 1500 or Sierra/Silverado HD (2500/3500), plus engine and RPO codes. Use the service-parts label (RPO list) to confirm before ordering — it’s the fastest way to identify the exact unit.
| Model year | Truck | Common engine(s) | Common transmission(s) | RPO / notes (quick check) |
|---|---|---|---|---|
| 2007 | Sierra/Silverado 1500 | Varies by trim (V8 packages commonly) | 6L80 (6-speed) may be present on some builds | MYC = 6L80. 2007 has “Classic” carryover models—verify by RPO label. |
| 2008 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | MYC = 6L80 (some 1500s also came with other automatics — RPO is the tie-breaker). |
| 2009 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | Confirm MYC on the service-parts label. |
| 2010 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | Confirm MYC on the service-parts label. |
| 2011 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | Confirm MYC on the service-parts label. |
| 2012 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | Confirm MYC on the service-parts label. |
| 2013 | Sierra/Silverado 1500 | Varies by trim | 6L80 (6-speed) may be present on some builds | Confirm MYC on the service-parts label. |
| 2014 | Sierra/Silverado 1500 | 4.3L / 5.3L (and some 6.2L builds) | 6L80 (6-speed) | MYC is the common 6-speed code on 2014 1500s equipped with 6L80. |
| 2015 | Sierra/Silverado 1500 | 4.3L / 5.3L (base & some trims) | 6L80 (6-speed) | MYC = 6L80. Many 6.2L (and some higher-trim 5.3L) use 8L90 (M5U/M5X). |
| 2016 | Sierra/Silverado 1500 | 4.3L / 5.3L (base & some trims) | 6L80 (6-speed) | MYC = 6L80. Higher trims may be 8L90 (M5U/M5X). |
| 2017 | Sierra/Silverado 1500 | 4.3L / 5.3L (base & some trims) | 6L80 (6-speed) | MYC = 6L80. Higher trims may be 8L90 (M5U/M5X). |
| 2018 | Sierra/Silverado 1500 | 4.3L / 5.3L (base & SLE common) | 6L80 (6-speed) | MYC = 6L80. Many SLT/Denali 5.3L and 6.2L use 8L90 (M5U/M5X). |
| 2019 | Sierra/Silverado 1500 | 4.3L + some 5.3L (esp. carryover/Limited) | 6L80 (6-speed) on some builds | Look for MYC. 2019 can also be 8L90 (M5U/M5X) or 10L80 (MQB/MQC) depending on configuration. |
| 2020 | Sierra/Silverado 1500 | 4.3L + some 5.3L configurations | 6L80 (6-speed) on some builds | Look for MYC. Other builds may use 8L90 (M5U/M5X) or 10L80 (MQB/MQC). |
| 2021 | Sierra/Silverado 1500 | 4.3L (and limited carryover configs) | 6L80 (6-speed) on some builds | Many 4.3L trucks require MYC (6-speed). Other engines/trims may be 8L90 or 10L80 — verify. |
