Product Description

🔧 Twisted Street™ 8L90 Performance Transmission – Up to 450 HP

Name: Twisted Street™ 8L90 Performance Transmission
Brand: Twisted Torque
SKU: TT-8L90-ST-450
Price: 3995 USD
Availability: OutOfStock

OEM+ Strength. Daily-Driver Smooth. Built the Twisted Torque™ Way.

The Twisted Street™ 8L90 is our upgraded replacement build for daily-driven GM trucks, SUVs and performance vehicles.

Rated for up to 450 HP, this build addresses the clutch, hydraulic and wear issues we commonly see in the 8L90 while keeping factory-style drivability.

This isn't a race transmission with neck-snapping shifts. It's a properly built 8L90 for stock and mildly modified vehicles that need to work, tow and drive every day.

🔥 IDEAL FOR

✔ Stock or mildly modified 5.3L / 6.2L applications

✔ Daily-driven trucks & SUVs

✔ Tow / haul applications

✔ Work trucks

✔ Camaro / Corvette street applications

✔ Properly configured LS / LT swaps under 450 HP

🔧 TWISTED STREET™ BUILD SPECS

✔ HD Clutches & Steels

Complete clutch overhaul using upgraded friction components and steels for improved heat resistance and durability.

Clutch clearance and piston travel are checked during assembly. The 8L90 is sensitive to clutch fill volume and apply timing, so we build the clutch packs to the correct configuration instead of blindly adding friction capacity.

✔ 8L90 Clutch Updates Verified

The core is identified during teardown and the correct early/late components are used for the application.

Builders verify:

• 2018-up 2-3-4-6-8 clutch piston, seals & wave plate design

• 2018-up 1-2-7-8-R return spring design

• 2019-up 4-5-6-7-8-R friction design

• 2019-up 1-3-5-6-7 return spring design

• 8L90A 4-clutch vs. 8L90B 5-clutch C1 drum configuration

Early and late parts are NOT automatically mixed or back-serviced. The transmission is built to the correct application and calibration.

✔ Pump Inspected & Serviced

The 8L90's off-axis chain-driven pump is completely inspected.

Pump, chain, drive and driven components, pump surfaces and related sealing components are checked for wear or damage and serviced or replaced as required.

Early and late pump components are identified before assembly. Covers, gaskets and related components are kept with the correct pump design.

✔ Valve Body Inspected & Hydraulically Corrected

The valve body is disassembled and inspected for wear in the critical 8L90 circuits, including:

• Pressure regulator / shuttle

• Actuator Feed Limit (AFL)

• Signal accumulators

• Clutch control circuits

• Converter feed limit

• TCC control

Sonnax and/or TransGo hydraulic corrections are installed where required based on valve-body condition and design.

We're not throwing the same universal kit into every 8L90. We repair the hydraulic problems we find.

✔ Early / Late S4 Valve Body Verified

Late-2018 / 2019-up S4 valve-body design is identified before repair.

Early and late S4 control-valve designs are not blindly interchanged, and the correct repair components are used for the valve body being built.

✔ Signal Accumulator Wear Addressed

Signal accumulator bores and pistons are inspected for wear and hydraulic leakage.

Worn circuits are repaired as required to help prevent pressure loss, flare shifts, soft shifts and clutch failure.

✔ Solenoids Identified & Kept in Position

The 8L90 uses flow-characterized Variable Force Solenoids.

S1-S9 are identified during teardown and kept with their original valve body and location.

Solenoids and internal electrical components are inspected and checked. Failed or damaged components are replaced as required.

We do not dump a handful of used solenoids together and pick nine that fit.

✔ Complete Overhaul

Street builds include:

• New clutch friction components & steels

• New seals & sealing rings

• New gaskets

• New filter

• Bushings inspected / replaced as required

• Bearings & thrust components inspected / replaced as required

• Drums, shafts and hard parts inspected / replaced as required

• Internal electrical components inspected / replaced as required

✔ STOCK-STALL TORQUE CONVERTER INCLUDED

Every Twisted Street™ 8L90 includes an application-matched stock-stall torque converter.

The Street converter is intended to retain factory-style stall and drivability for daily driving, towing and normal street use.

Higher-stall and upgraded performance converter options are available for cammed or modified vehicles.

⚙️ PROGRAMMING / RELEARN

After installation, the proper GM programming, solenoid characterization and/or Fast Learn/adaptive procedures must be performed as applicable to the vehicle and components installed.

Modified vehicles, swaps and performance converter applications may also require custom transmission tuning.

Programming cannot fix incorrect clutch clearance, mismatched internal parts, an installation problem or incorrect fluid level.

⚠️ VIN REQUIRED – NOT EVERY 8L90 IS THE SAME

Our rebuildable cores may come from different 8L90 applications and production years.

That's why the customer's VIN determines the build configuration, not the donor core.

Case/output configuration, converter, pump, clutch drums, pistons, springs, valve body and calibration-sensitive components are identified and matched to the required application before assembly.

Common 8L90 Applications

Chevrolet: Silverado 1500, Tahoe, Suburban, Camaro & Corvette

GMC: Sierra 1500, Yukon & Yukon XL

Cadillac: Escalade, CTS-V & select 8L90-equipped applications