🔥 Twisted Pro™ 6L90E Performance Transmission — 700 HP

More Clutch Capacity. Stronger Holding Power. Built the Twisted Torque™ Way.

The Twisted Pro™ 6L90E is our heavy-duty performance transmission for modified GM trucks, muscle cars, and LS-powered vehicles making up to 700 engine HP.

Pro starts with the factory corrections found in our Twisted Street™ 6L90E, then adds higher-capacity performance clutch packs, stronger clutch application, and pressure control matched to the increased load.

Every transmission is completely torn down, cleaned, inspected, and rebuilt in-house with a NEW Pump & Bellhousing Assembly, performance frictions, new matching steels, and updated internal parts.

Target Performance Rating: Up to 700 Engine HP — Subject to Application Approval

⚡ TEHCM PROGRAMMING — INCLUDED

Every 6L90E includes a programmed TEHCM matched to your application. Factory replacements are programmed using your vehicle's VIN. Engine swaps and aftermarket applications may require a compatible donor VIN or base calibration. If you require a BLANK, unprogrammed TEHCM, just let us know when ordering. Installation Fast Learn or additional vehicle tuning may still be required.

⚙️ TWISTED PRO™ 6L90E BUILD SPECIFICATIONS

✔ Complete Teardown, Cleaning & Inspection

Every transmission is stripped down to the bare case. Clutch drums, shafts, hubs, planetary gearsets, bearings, and internal parts are cleaned and inspected for cracks, worn splines, damaged bearing surfaces, and excessive wear.

✔ NEW Pump & Bellhousing Assembly

Every Twisted Pro™ receives a NEW Pump & Bellhousing Assembly, not a reused or resurfaced original.

PRO UPGRADE — HD Pump Slide Spring

Builder Spec: Sonnax #104534-HD, unless the new pump already contains an equivalent spring.

The heavier pump slide spring helps maintain oil volume at higher engine RPM. Pump pressure, pressure-regulator operation, and converter feed are checked during assembly.

✔ Twisted Torque™ HD Performance Clutches & NEW Steels

New high-energy performance friction plates and matching steels are installed throughout the transmission.

PRO UPGRADE: Increased clutch capacity in the 3-5-Reverse, 4-5-6, and 2-6 clutch assemblies, using performance clutch arrangements selected for the 6L90E.

✔ Updated 1-2-3-4 Clutch Assembly

The 1-2-3-4 clutch is rebuilt with new performance frictions, matching steels, and an updated apply piston.

Builder Spec: Sonnax #104984-01 Heavy-Duty Apply Piston or approved equivalent.

The factory piston is a known cracking point that can cause pressure loss and slipping in forward gears.

The drum, retaining-ring grooves, wave plate, and related parts are inspected. Clutch clearance is measured and set during assembly.

✔ PRO UPGRADE — High-Capacity 3-5-Reverse Clutch & Drum

Alto Performance Clutch Upgrade — Increased Holding Capacity

Builder Spec: Alto #195757B G3 PowerPack or approved 6L90-compatible performance clutch arrangement.

The 3-5-Reverse clutch receives an upgraded performance friction and steel arrangement for improved holding power under increased engine torque.

The drum is inspected for cracks, damaged welds, worn splines, and retaining-ring damage. Updated factory parts are installed where applicable.

Clutch clearance is checked for the selected performance clutch pack.

✔ PRO UPGRADE — High-Capacity 4-5-6 Clutch Assembly

8-Friction Clutch Pack — Increased Capacity Over the Factory 7-Friction Arrangement

Builder Spec: Sonnax #104960-10K High-Capacity 4-5-6 Apply-Piston Kit.

The factory 6L90 4-5-6 clutch uses seven frictions. Our proposed Pro arrangement increases capacity to eight OE-style 36-tooth frictions, using the matching apply parts and steels.

The Sonnax kit includes a modified apply piston, piston dam, toothed apply plate, and stronger backing plate.

The additional friction increases clutch holding surface, while the backing plate helps resist flexing and uneven clutch application.

Builder Note: This configuration eliminates the factory wave plate. Verify clutch stack height, apply clearance, and transmission calibration for the installed eight-friction arrangement.

✔ PRO UPGRADE — High-Performance 2-6 Clutch Assembly

Builder Spec: Alto #195758A 6L90E Performance PowerPack or approved matching equivalent.

The 2-6 clutch receives an upgraded performance clutch pack with matching steels.

The apply piston, sealing surfaces, and clutch housing are inspected for wear. Clutch clearance is measured for the installed performance arrangement.

✔ Updated Low/Reverse Clutch & Sprag

The Low/Reverse clutch receives new frictions, steels, and seals.

The sprag, races, end caps, and retaining parts are checked for wear or damage.

Builder Reference: Sonnax #104642-90SK — 6L90-specific Low/Reverse Sprag Repair Kit, when required.

✔ PRO UPGRADE — Pump & Valve Body — Modified & Updated the Twisted Torque™ Way

The valve body is completely disassembled, cleaned, inspected, and rebuilt to correct factory pressure-control problems.

Worn valves, sticking clutch-select valves, converter clutch regulator problems, and pressure loss are corrected.

PRO CALIBRATION: Pressure control and shift operation are matched to the high-capacity 3-5-Reverse, 4-5-6, and 2-6 clutch assemblies.

Increased clutch holding pressure under load while retaining clean, controlled shifts during normal driving.

✔ TransGo TCC & Clutch-Select Valve Corrections

Applicable TransGo updates are installed to correct known converter clutch regulator and clutch-select valve problems.

These repairs help prevent converter cycling, delayed clutch engagement, low-speed shudder, and inconsistent shifting.

✔ Pressure Regulator & Boost Valve Updates

Pressure-regulator and boost-valve wear points are inspected and corrected.

The pressure-control setup is matched to the Pro clutch arrangement and intended engine load.

✔ Output Planetary Inspection & Lubrication

The output planetary assembly is inspected for worn pinions, damaged bearings, cracked gears, heat marks, and restricted oil flow.

Builder Reference: Sonnax #104584-90K — 6L90 Output Planet Saver Kit, where required.

Damaged or worn planetary parts are replaced.

✔ Complete Bushing Replacement

New replaceable bushings installed throughout the transmission.

Shaft support, bushing fit, and running clearances are checked during assembly.

✔ New Gaskets, Seals & Sealing Rings

New internal gaskets, seals, and sealing rings installed throughout the transmission.

Stator support and clutch-feed sealing surfaces are inspected for wear.

✔ New Transmission Filter

A new transmission filter is installed with every build.

✔ Internal Hard Parts Inspected & Measured

Input and output shafts, intermediate shaft, clutch drums, hubs, planetary gearsets, sun gears, bearings, and related parts are checked for cracks, wear, and damage.

Worn or damaged parts are replaced.

The standard Pro retains the inspected factory-style intermediate shaft and 4-5-6 hub. The one-piece 300M billet upgrade is reserved for Twisted Punisher™.

✔ Final Assembly, Clutch Clearance & Air Checks

Clutch packs are measured and clearanced for the selected performance parts.

Each clutch assembly is air-checked for proper application before the transmission is completed.

Shaft endplay, pump operation, and internal clearances are verified.

✔ Application-Specific Assembly & Setup

Each transmission is built for the correct engine, drivetrain, vehicle weight, and factory 6L90 configuration.

2WD, 4WD, truck, van, Camaro ZL1, CTS-V, and custom applications are verified before assembly.

💥 SUPER DUTY BILLET COVER TORQUE CONVERTER — INCLUDED

Every Twisted Pro™ includes our Super Duty Billet Cover Torque Converter at stock stall speed, matched to the engine and vehicle application.

The stronger billet cover helps resist flexing under load while retaining the factory-style stall characteristics needed for everyday driving.

✔ Super Duty Billet Cover

✔ Stock Stall Speed — Application Matched

✔ Matched to Engine & Vehicle

✔ INCLUDED With Every Twisted Pro™ Build

No additional converter purchase required.

A heavy-duty Silverado and a supercharged Camaro ZL1 require different converter setups. We match the converter to the application.

🔥 BUILT FOR

• Modified 5.3L, 6.0L, 6.2L, and 6.6L GM gas engines where equipped with the correct 6L90
• Tuned Camaro ZL1 and Cadillac CTS-V applications
• Performance Silverado and Sierra HD gas trucks
• Camshaft, intake, exhaust, and common engine upgrades
• Select mild boost and supercharger modifications
• Street-driven LS swaps and custom applications
• Heavy-duty daily driving and approved towing applications
• Customers needing increased clutch holding power over our Street build

Target Performance Rating: Up to 700 Engine HP

Engine torque, vehicle weight, tuning, tire size, gearing, towing loads, and intended use must be considered when selecting the correct transmission.

🚗 GM 6L90E VEHICLE APPLICATIONS

The Twisted Pro™ 6L90E is built for select Chevrolet, GMC, and Cadillac vehicles originally equipped with the GM 6L90 / 6L90E six-speed automatic transmission (RPO MYD).

CHEVROLET

• 2007–2019 Silverado 2500HD / 3500HD — Select 6.0L gasoline V8 applications
• 2020–2023 Silverado 2500HD / 3500HD — Select 6.6L gasoline V8 applications
• 2012–2015 Camaro ZL1 — Supercharged 6.2L V8 automatic
• Express 2500 / 3500 — Select factory 6L90 applications, subject to year and engine verification
• Suburban 2500 / 3500HD — Select heavy-duty factory 6L90 applications

GMC

• 2007–2019 Sierra 2500HD / 3500HD — Select 6.0L gasoline V8 applications
• 2020–2023 Sierra 2500HD / 3500HD — Select 6.6L gasoline V8 applications
• Savana 2500 / 3500 — Select factory 6L90 applications, subject to year and engine verification
• Yukon XL 2500 — Select heavy-duty factory applications

CADILLAC

• 2009–2015 CTS-V — Supercharged 6.2L V8, automatic-equipped models

ENGINE SWAPS & CUSTOM APPLICATIONS

We also build 6L90E transmissions for select LS swaps, performance vehicles, and custom heavy-duty applications.

Provide engine, transmission controller, drivetrain, modifications, and intended use before ordering.

IMPORTANT FITMENT INFORMATION

This listing is for the GM 6L90 / 6L90E (RPO MYD) ONLY. It is NOT a direct replacement for the 6L80E (RPO MYC).

Not every vehicle in the listed year ranges uses a 6L90.

Duramax/Allison applications and later 10-speed-equipped vehicles are excluded.

VIN and factory transmission identification are required before ordering.

🔥 NEED MORE THAN PRO?

The Twisted Pro™ 6L90E is intended for modified street and approved heavy-duty applications up to 700 engine HP.

Running higher boost, making serious engine torque, launching on sticky tires, or building for regular dragstrip use?

Our Twisted Punisher™ and Twisted Executioner™ 6L90E Performance Transmissions will offer 6L90-specific billet shafts, stronger clutch systems, and upgraded performance converters.

Tell us the vehicle. Tell us the motor. Tell us the modifications. Tell us how you're actually going to drive it.

We'll help match the right transmission to your build.

📞 833-858-9612

Twisted Torque™ — Built for the Application. Not the Catalog.