The Hydra-Matic 6L80 (production code MYC) is a six-speed automatic transmission produced by General Motors for use in rear- and rear-biased all-wheel-drive vehicles with a longitudinal powertrain orientation. Developed in-house by General Motors, the Hydra-Matic 6L80 is part of the 6LXX family of fuel-saving, electronically controlled six-speed automatic transmissions that succeeded the 5LXX family.
The modular design of the Hydra-Matic 6L80 (MYC) is shared with variants rated for different torque levels to accommodate various engines and vehicle applications. All versions share a unique output gearset configuration that enables it a wider range of ratios than a conventional planetary gearset automatic transmission. This allows the transmission to be tailored for optimal fuel economy while delivering excellent acceleration traits.
The wide overall ratio spread of 6.04:1 allows a “steep” first gear, as well as a very “tall” overdrive top gear for low-rpm highway cruising.
Modular Design
The modular concept of the Hydra-Matic 6L80 centers on the desire for common components and manufacturing tooling for four different size variants of the six-speed family. All versions use three gearsets: a simple input planetary gearset and two output gearsets, one of which is a compound gearset with three pairs of two pinion gears on the output carrier, one pair meshing with the sun gear and the other with the ring gear.
Performance Algorithm Braking
Performance Algorithm Shifting is available on some applications. Performance Algorithm Shifting (PAS) monitors how assertively the driver is using engine output to determine at what engine speed to upshift or downshift.
Driver Shift Control
Driver Shift Control allows the driver to shift the transmission like a clutchless manual gearbox. Electronic safeguards prevent over-revving should the wrong gear position be accidentally selected.
Advanced Control System
Advances in transmission control modules allow them to exist reliably inside the transmission, where temperatures remain fairly constant compared to a body-mounted module. The transmission and module are assembled together, so no additional steps are necessary during vehicle assembly.
The 6L80’s 32-bit transmission control module (TCM) monitors transmission performance and compensates for normal wear in components such as clutch plates, so transmission performance remains consistent for the life of the transmission.
| Type: | Six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module |
| Maximum engine power: | 469 bhp (349 kw) |
| Maximum engine torque: | 439 lb-ft (595 Nm) |
| Maximum gearbox torque: | 664 lb-ft (900 Nm) |
| Gear Ratios | |
| First: | 4.030 |
| Second: | 2.360 |
| Third: | 1.530 |
| Fourth: | 1.150 |
| Fifth: | 0.850 |
| Sixth: | 0.670 |
| Reverse: | 3.060 |
| Maximum shift speed: | 6500 rpm |
| Maximum Validated Weight (GVW): | 8600 lb (3901 kg) |
| Maximum Validated Weight (GCVW): | 14000 lb (6350 kg) |
| 7-position quadrant: | P, R, N, D, X, X, X (X = available calibratable range position) |
| Case material: | Die cast aluminum |
| Shift pattern: | (2) Three-way on/off solenoids |
| Shift quality: | Five variable bleed solenoid |
| Torque converter clutch: | Variable Bleed Solenoid ECCC |
| Converter size: | 300 mm |
| Fluid type: | DEXRON VI |
| Fluid capacity with 258 mm converter: | 9.7L (8.22 kg) |
| Fluid capacity with 300 mm converter: | 11.9L (10.1 kg) |
| Pressure taps available: | Line pressure |
| Assembly sites: | GMPT Toledo, Ohio, USA; GMPT Silao, Mexico |
| Available Control Features | |
| Multiple Shift Patterns (Selectable) | |
| Driver Shift Control (Tap Up / Tap Down) | |
| Enhanced Performance Algorithm Shifting (PAS) | |
| Selectable Tow / Haul Mode | |
| Engine Torque Management On All Shifts | |
| Altitude and Temperature Compensation | |
| Adaptive Shift Time | |
| Neutral Idle | |
| Reverse Lockout | |
| Automatic Grade Braking | |
| Additional Features | |
| OBDII / EOBD | |
| Integral Electro/Hydraulic Controls Module (Tehcm) | |
| Control Interface Protocol – GMLAN | |
| Vehicle | Engine |
|---|---|
| Cadillac Escalade | 6.2L V8 Vortec NA |
| Cadillac Escalade ESV | 6.2L V8 Vortec NA |
| Chevrolet Camaro SS (Coupe, Convertible) | 6.2L V8 L99 NA |
| Chevrolet Camaro SS (Coupe, Convertible) | 6.2L V8 LS3 NA |
| Chevrolet Caprice PPV | 6.0L V8 L77 NA |
| Chevrolet Corvette (Coupe, Convertible) | 6.2L V8 LT1 NA |
| Chevrolet Corvette Z51 (Coupe, Convertible) | 6.2L V8 LT1 NA |
| Chevrolet SS Performance Sedan | 6.2L V8 LS3 NA |
| Chevrolet Silverado (all cabs) | 4.3L V6 LV3 NA |
| Chevrolet Silverado (all cabs) | 5.3L V8 L83 NA |
| Chevrolet Silverado (double cab, crew cab) | 6.2L V8 L86 NA |
| Chevrolet Tahoe | 5.3L V8 Vortec NA |
| Chevrolet Suburban | 5.3L V8 Vortec NA |
| GMC Sierra (all cabs) | 4.3L V6 LV3 NA |
| GMC Sierra (all cabs) | 5.3L V8 L83 NA |
| GMC Sierra (double cab, crew cab) | 6.2L V8 L86 NA |
| GMC Yukon | 5.3L V8 Vortec NA |
| GMC Yukon XL | 5.3L V8 Vortec NA |
| GMC Yukon Denali | 6.2L V8 Vortec NA |
| GMC Yukon XL Denali | 6.2L V8 Vortec NA |
