GM 6L90 Transmission for Sale | OEM Used GM Hydra-Matic 6L90 / 6L90E Heavy-Duty 6-Speed Automatic Transmission
$2,695.00
At a Glance
- Condition: OEM used, all 6 forward gears and reverse function tested
- Availability: In stock, used GM 6L90 transmissions available
- Shipping: Free shipping to all 50 states via freight pallet, 5 to 10 business days
- Donor vehicle confirmed (Silverado HD, Sierra HD, Express, Savana, Suburban, CTS-V, Camaro ZL1)
- Engine pairing confirmed (6.6 Duramax, 6.0 Vortec, 6.2 EcoTec3, 5.3 EcoTec3, 6.2 LSA Supercharged)
- All 6 forward gears and reverse tested
- Torque converter lockup function verified
- Adaptive shift operation confirmed
- Tow/Haul Mode function verified
- TCM calibration documented
- Fluid inspection for burned smell or metal contamination
- 100% inspection before every order ships
- No core charge required
- Backed by a 15 day replacement warranty against internal defects
Description
About the GM 6L90 Transmission
The 6L90 transmission, developed by General Motors, is renowned for its robust performance in heavy-duty truck applications and high-performance car applications. It is designed to handle high torque outputs efficiently (590 to 700-plus lb-ft), making it suitable for the Silverado / Sierra 2500HD / 3500HD pickup trucks, full-size SUVs, commercial vans, and the high-output Cadillac CTS-V and Chevrolet Camaro ZL1. Known for its durability, the 6L90 offers smooth shifting and reliability under demanding conditions, enhancing vehicle performance and drivability. Its design integrates advanced electronic controls to optimize fuel efficiency and power delivery, ensuring a balanced driving experience across the wide range of applications. Overall, the 6L90 transmission reflects GM commitment to engineering excellence, providing a transmission solution that meets the rigorous demands of heavy-duty trucks, commercial vans, performance sedans, and muscle cars alike.
The GM Heavy-Duty Automatic Family Context
The 6L90 is the modern GM heavy-duty automatic transmission, succeeding the legendary 4L80E (our vaz87 listing) in many heavy-duty applications. The two transmissions are corporate cousins but different generations: the 4L80E (1991-2014 production) is the electronic evolution of the TH400 with 4 forward gears, deep mechanical heritage, and the dominant pre-2007 GM heavy-duty automatic. The 6L90 (2007-2019 production) is the modern 6-speed evolution with electronic adaptive shift, 6 forward gears, and lockup in three gears (4th, 5th, 6th). The 4L80E and 6L90 are NOT directly interchangeable due to different bellhousing patterns, different TCM architectures, different fluid specifications, and different mounting positions. Tell us your specific year and chassis when ordering.
Why Choose a Used 6L90 Transmission
The 6L90 transmission is renowned for its capability to handle high horsepower and torque, making it an excellent choice for various GM truck, SUV, van, and high-performance applications. When you opt for this 6L90 transmission for sale at Part Nests, you are getting:
- Cost-effective performance upgrade compared to dealer reman
- Proven reliability across multiple GM applications
- Compatibility with the entire GM Hydra-Matic 6L90 vehicle lineup
- Potential for high-power applications (CTS-V and Camaro ZL1 use the same case)
- Environmentally friendly choice (reusing a quality used transmission)
- Proven performance history with documented donor vehicle
Features of the 6L90 Transmission
- Tow/Haul Mode: Optimizes shift points and engine braking for improved control when towing heavy loads. Critical for Silverado 2500HD / 3500HD trailer applications.
- Manual Mode: Enables manual gear selection (1-6) for a more engaged driving experience, popular in CTS-V and Camaro ZL1 performance applications.
- Adaptive Shift Controls: Adjusts shift patterns based on driving conditions, load, and grade for enhanced performance and efficiency.
- Torque Converter Lock-Up: Enhances fuel efficiency by minimizing slip between the engine and transmission at cruising speeds. Locks up in 4th, 5th, and 6th gears.
- Integrated Cooling System: Maintains optimal transmission temperatures under heavy loads or high-stress conditions. Critical for Duramax towing applications.
- Grade Braking: Automatically downshifts to assist in vehicle control during descents, reducing brake wear on long downhill grades.
- Wide Gear Ratio Spread: Provides a balance between acceleration and fuel efficiency with a broad range of gear ratios (1st 4.027 to 6th 0.667).
- Electronic Range Select: Allows drivers to limit the highest gear available, enhancing control in challenging terrain or towing situations.
- Adaptive Traction Control Integration: Coordinates with traction control and StabiliTrak systems for optimized power delivery in various road conditions.
- Performance Modes (Cadillac CTS-V and Camaro ZL1): Specific variants offer sport or performance modes, adjusting shift points and responsiveness for a more dynamic driving experience.
6L90 Transmission Fits
Vehicles:
- Chevrolet Silverado 2500HD / 3500HD (2007 to 2019)
- GMC Sierra 2500HD / 3500HD (2007 to 2019)
- Chevrolet Express 2500 / 3500 (2010 to present) commercial vans
- GMC Savana 2500 / 3500 (2010 to present) commercial vans
- Chevrolet Suburban 2500 (2008 to 2019) heavy-duty SUV
- Cadillac CTS-V (2009 to 2013) with 6.2L LSA supercharged V8 (556 HP)
- Chevrolet Camaro ZL1 (2012 to 2015) with 6.2L LSA supercharged V8 (580 HP)
Engines:
- 6.6L Duramax V8 Turbo-Diesel (LBZ, LMM, LML, L5P generations)
- 6.0L Vortec V8 (LY6, L96)
- 6.2L EcoTec3 V8 (L86, L94 some applications)
- 5.3L EcoTec3 V8 (L83 some applications)
- 4.3L Vortec V6 (LV3, some applications)
- 6.2L LSA Supercharged V8 (CTS-V and Camaro ZL1 applications)
Quality Assurance for Our Used 6L90 Transmissions
When you purchase a used 6L90 transmission from Part Nests, you can be confident in its quality:
- Thoroughly inspected and tested across all 6 forward gears
- Donor vehicle and engine pairing confirmed (critical since 6.6 Duramax calibration differs from 6.2 LSA Supercharged calibration)
- Low-mileage units available when possible
- Competitive pricing vs Chevy dealer reman
Installation Considerations
Before installing your used 6L90 transmission:
- Ensure compatibility with your vehicle model and year (Silverado/Sierra HD vs CTS-V vs Camaro ZL1 calibrations differ)
- Plan for TCM (Transmission Control Module) reprogramming for proper calibration matching
- Consider professional installation for optimal performance and warranty preservation
- Replace torque converter at installation if showing wear or fluid contamination
Common Issues and Solutions
While the 6L90 is known for its robustness, some units may experience:
- Torque converter issues (fluid contamination is the leading cause)
- 2-3 shift flare (typically valve body or accumulator issue)
- Solenoid degradation in high-mileage units
- Tailshaft housing leaks (replaceable seal at installation)
Our used 6L90 transmissions are carefully inspected to minimize these risks, and we offer support for any concerns that may arise.
Vehicle Compatibility
| Vehicle | Compatibility |
|---|---|
| Chevrolet Silverado 2500HD / 3500HD (2007-2019) | Heavy-duty pickup |
| GMC Sierra 2500HD / 3500HD (2007-2019) | Heavy-duty pickup |
| Chevrolet Express 2500 / 3500 (2010+) | Commercial van |
| GMC Savana 2500 / 3500 (2010+) | Commercial van |
| Chevrolet Suburban 2500 (2008-2019) | Heavy-duty SUV |
| Cadillac CTS-V (2009-2013) | Performance sedan with 6.2L LSA supercharged |
| Chevrolet Camaro ZL1 (2012-2015) | Performance muscle car with 6.2L LSA supercharged |
Inspection Workflow
- Donor vehicle confirmed (Silverado HD, Sierra HD, Express, Savana, Suburban, CTS-V, Camaro ZL1)
- Engine pairing confirmed (Duramax, Vortec, EcoTec3, LSA Supercharged)
- All 6 forward gears and reverse tested
- Torque converter lockup function verified
- Adaptive shift operation confirmed
- Tow/Haul mode function verified (truck applications)
- TCM calibration documented
- Fluid inspection for burned smell, metal contamination, or coolant contamination
- External case visual inspection
- 2WD vs 4WD output configuration confirmed
Why Buy From Part Nests
- Donor vehicle and engine pairing confirmed
- All 6 forward gears and reverse tested
- Torque converter lockup verified
- Adaptive shift confirmed
- Tow/Haul mode function verified
- 2WD vs 4WD output configuration confirmed
- Free freight pallet delivery to all 50 states
- 15 day replacement warranty on internal defects
- GM-experienced support team on the phone
- Call (240) 306-7051 to confirm donor vehicle (Silverado HD, Sierra HD, Express, Savana, Suburban 2500, CTS-V, Camaro ZL1), engine pairing (6.6 Duramax, 6.0 / 6.2 EcoTec3, 5.3 EcoTec3, 4.3 Vortec, or 6.2 LSA Supercharged), 2WD / 4WD configuration, and GM heavy-duty automatic lineage questions (4L80E predecessor per our vaz87 listing, 6L90 successor per this listing) before ordering
15 Day Replacement Warranty
Every used GM 6L90 transmission purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Internal defects already present when the transmission arrives
- Gear or shaft failures within 15 days from installation
- Loss of any of the 6 forward gears or reverse within 15 days from installation
- Torque converter lockup failures within 15 days from installation (where TCC was documented as functional at shipping)
- Valve body or electronic shift mechanism failures within 15 days from installation
- Adaptive shift logic failures within 15 days from installation
- Tow / Haul Mode logic failures within 15 days from installation
- Case crack failures not disclosed at shipping
- Incorrect engine pairing calibration (6.6 Duramax vs 6.2 LSA Supercharged vs other) due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from operating with incorrect transmission fluid (GM Dexron VI ATF is required for the 6L90; do NOT substitute Dexron III)
- Damage from neglected fluid maintenance
- Damage from incorrect bellhousing or flexplate alignment
- Damage from incorrect cooler line installation or transmission cooler failure
- Damage from operating beyond the stock torque rating without performance internals (the CTS-V and Camaro ZL1 share the same 6L90 case as the truck applications but with calibration tuned for sustained high-output operation; cross-installation between truck and performance car applications requires TCM reprogramming)
- Damage from TCM (Transmission Control Module) parameter mismatch with the new chassis
- External components (TCM if separately documented, driveshaft, transmission mount, shift cable / linkage, dipstick, external cooler lines, transmission cooler, flexplate) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- All 6 Forward Gears Tested: Plus reverse function verified before shipping
- Engine Pairing Confirmed: 6.6 Duramax, 6.0/6.2 EcoTec3, 5.3 EcoTec3, 4.3 Vortec, or 6.2 LSA Supercharged documented
- Torque Converter Lockup Verified: Lockup operation in 4th, 5th, 6th gears confirmed
- Adaptive Shift Logic Verified: Modern shift algorithm operation confirmed
- 2WD / 4WD Output Configuration Confirmed: Transfer case mating verified
- 15 Day Replacement Cover: Internal defects protected from delivery onward
Additional information
| bellhousing-to-tailshaft-length | 23 inches |
|---|---|
| fluid-capacity | 10-12 quarts |
| fluid-type | Automatic transmission fluid (ATF), GM Dexron VI |
| gear-ratios | 1st: 4.027, 2nd: 2.364, 3rd: 1.532, 4th: 1.152, 5th: 0.852, 6th: 0.667, Reverse: 3.064 |
| input-shaft-spline-count | 30 Splines |
| output-shaft-spline-count | 32 splines |
| overall-length | 28.97 inches |
Different GM heavy-duty automatic generations. The 4L80E (our vaz87 listing, 1991-2014 production) is the electronic evolution of the TH400 with 4 forward gears, deep mechanical heritage, and the dominant pre-2007 GM heavy-duty automatic. The 6L90 (this listing, 2007-2019 production) is the modern 6-speed Hydra-Matic with electronic adaptive shift, 6 forward gears, torque converter lockup in three gears (4th, 5th, 6th), and integration with modern engine ECUs. The two are corporate cousins but NOT directly interchangeable due to different bellhousing patterns, different TCM architectures, different fluid specifications (the 4L80E uses Dexron III; the 6L90 uses Dexron VI), and different mounting positions. The 6L90 has more gears, smoother operation, and better fuel economy; the 4L80E has higher absolute torque headroom in built form. Choose the transmission that matches your chassis.
Wide range across the GM heavy-duty and performance lineup. Diesel pairings: 6.6L Duramax V8 turbo diesel across multiple generations (LBZ 2006-2007, LMM 2007-2010, LML 2011-2016, L5P 2017-present in some applications). Gasoline truck pairings: 6.0L Vortec V8 (LY6, L96), 6.2L EcoTec3 V8 (L86, L94 some applications), 5.3L EcoTec3 V8 (L83 some applications), 4.3L Vortec V6 (LV3 some applications). High-output performance pairings: 6.2L LSA Supercharged V8 in the Cadillac CTS-V (2009-2013, 556 HP) and Chevrolet Camaro ZL1 (2012-2015, 580 HP). The 6L90 in performance car applications shares the same case as the truck applications but with calibration tuned for sustained high-output operation.
GM heavy-duty trucks, SUVs, vans, and performance cars. Heavy-duty pickups: Chevrolet Silverado 2500HD / 3500HD (2007-2019), GMC Sierra 2500HD / 3500HD (2007-2019). Commercial vans: Chevrolet Express 2500 / 3500 (2010-present), GMC Savana 2500 / 3500 (2010-present). Heavy-duty SUV: Chevrolet Suburban 2500 (2008-2019). Performance cars: Cadillac CTS-V (2009-2013 with 6.2L LSA Supercharged V8), Chevrolet Camaro ZL1 (2012-2015 with 6.2L LSA Supercharged V8). All applications share the same fundamental 6L90 case but with different TCM calibrations and torque converters specific to the engine pairing.
590 to 700-plus lb-ft. The 6L90 is engineered to handle high torque outputs across its application range. Standard truck pairings handle 590 lb-ft from the early 6.6 Duramax LBZ / LMM applications. Higher-rated applications handle 700-plus lb-ft from the modern L5P Duramax and from the 6.2L LSA Supercharged V8 in CTS-V and Camaro ZL1 applications. Performance-built 6L90 variants with upgraded torque converter, valve body, and internal hard parts can handle substantially higher torque for aftermarket builds. The 6L90 case shares architecture across all applications, providing structural headroom for performance modifications.
Lockup engages in 4th, 5th, and 6th gears for fuel economy. The 6L90 uses an electronically controlled lockup torque converter that engages in 4th, 5th, and 6th gears at cruising conditions. Lockup eliminates torque converter slip during sustained cruising, improving fuel economy and reducing converter heat generation. The TCM uses inputs from throttle position, vehicle speed, engine load, and grade detection to control lockup engagement and disengagement smoothly. Lockup failure (failure to engage or failure to disengage cleanly) is one of the high-mileage 6L90 service items; we test lockup function on every 6L90 we ship and disclose any concerns. At engine installation, lockup torque converter inspection or replacement is recommended if the converter shows wear indicators.
Critical since 6.6 Duramax calibration differs from 6.2 LSA Supercharged. The 6L90 Transmission Control Module (TCM) contains an engine-specific parameter file that calibrates shift points, lockup behavior, and adaptive shift logic for the paired engine. The Duramax diesel pairing has different shift behavior than the LSA Supercharged gasoline pairing, which differs again from the standard Vortec / EcoTec3 V8 pairings. Cross-installation between engine pairings requires TCM reflash to the correct calibration by a GM-authorized dealer or aftermarket TCM tuner. We document the original engine pairing on every 6L90 we ship; at engine installation, plan for TCM reprogramming if the new chassis uses a different engine than the donor.
Effectively the same transmission; E designates electronic. The 6L90 and 6L90E references generally refer to the same Hydra-Matic 6-speed transmission. The E suffix in some references indicates the electronic-control architecture (Transmission Control Module, electronically controlled shift solenoids, adaptive shift logic), which is the standard architecture for the 6L90. Some references drop the E for brevity; some include it for clarity. We use the names interchangeably and confirm the specific calibration variant on every order. The 6L90 / 6L90E is distinguished from related GM 6L family members by case size and torque rating: the 6L80 is the medium-duty version (lower torque rating, smaller case); the 6L90 is the heavy-duty version (this listing).
No. There is no core return required.
2 reviews for GM 6L90 Transmission for Sale | OEM Used GM Hydra-Matic 6L90 / 6L90E Heavy-Duty 6-Speed Automatic Transmission
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Frederick A. –
Got a 6L90 for a 2015 Silverado 2500HD with 6.6 Duramax LML replacement. All 6 forward gears and reverse tested, torque converter lockup verified in 4th, 5th, and 6th, engine pairing correctly identified as Duramax (NOT the gasoline V8 calibration). Honest pre-purchase information about the GM heavy-duty automatic family lineage (4L80E predecessor per vaz87 → 6L90 successor per this listing) and the engine-specific TCM calibration requirement.
Vivienne O. –
Sourced a 6L90 for a Cadillac CTS-V (2011) replacement. Engine pairing correctly identified as 6.2L LSA Supercharged V8 (NOT the truck Duramax or Vortec calibration), adaptive shift verified, Manual Mode 1-6 logic confirmed. Honest pre-purchase information about the case shared between truck and performance car applications and the TCM calibration that differs by engine pairing.