🔥 Twisted Street™ 4L60E Performance Transmission

Rated for 350–450 HP

Daily Driving • Work Trucks • Light Towing • Mild Street Performance

The Twisted Street™ 4L60E is a dependable upgrade over a stock rebuild. Built for GM trucks, SUVs, vans and LS-powered street vehicles, it addresses the common 4L60E failure points while keeping the shifts clean and comfortable.

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🔧 TWISTED STREET™ BUILD SPECS

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Complete Overhaul Kit

New gaskets, seals, sealing rings and wear parts throughout the transmission.

High-Energy Clutches and New Steels

Improved friction material handles more heat and load than a basic stock clutch kit.

Upgraded 3–4 Clutch Pack

The 3–4 clutch is one of the most common failure points in the 4L60E. The clutch pack is upgraded and properly clearanced to improve holding power and prevent premature failure.

Hardened Heavy-Duty Sun Shell

Replaces the failure-prone factory reaction shell and helps prevent stripped splines and breakage around the hub.

New Heavy-Duty 29-Element Input Sprag

Provides dependable holding during the 1–2 shift and under increased load.

Kevlar 2–4 Band

Improves second- and fourth-gear holding power with better heat and wear resistance.

Performance Servo (Application Dependent)

Increases band apply force for a cleaner 1–2 shift and better 2–4 band control. Servo size and calibration are matched to the vehicle.

Updated Accumulator Pistons

Replaces worn or cracked factory pistons that can leak pressure and cause inconsistent shifts.

Modified Valve Body

The valve body is cleaned, inspected and updated to address:

• Pressure loss
• 2–3 flare
• Inconsistent shifts
• TCC slip and shudder
• Premature 3–4 clutch failure
• Premature 2–4 band failure

Upgraded Boost Valve

Improves line-pressure response under load for better clutch and band holding power without unnecessarily harsh shifts.

Reconditioned Front Pump

The front pump is inspected and reconditioned with:

• New pump bushing
• Inspected pump rotor and slide
• Inspected pressure-regulator valve and bore
• Inspected pump rings
• Checked pump clearances
• Verified converter and cooler flow
• 
  

New Internal Electronics

Includes:

• New EPC pressure-control solenoid
• New shift solenoids A and B
• New 3–2 control solenoid
• New TCC/PWM solenoid
• New internal wiring harness
• New pressure-switch manifold

New Bushings, Bearings and Thrust Washers

Replaced throughout the transmission to restore proper support, clearance and oil control.

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TORQUE CONVERTER INCLUDED

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A stock OEM-stall lockup torque converter is included.

Upgraded and custom-stall converter options are available.

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WHAT THIS BUILD ADDRESSES

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The factory 4L60E is known for:

• Burnt 3–4 clutches
• Broken or stripped reaction sun shells
• 2–4 band failure
• Worn accumulator pistons
• Low or unstable line pressure
• Worn valve-body bores
• Converter clutch slip and shudder
• Pump wear and pressure loss

The Twisted Street™ addresses these common problems while maintaining dependable daily drivability.

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BUILT FOR

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• Daily drivers
• Work trucks
• Light towing
• Weekend cruisers
• Stock replacement applications
• Stock and mildly modified engines
• Mild camshaft applications
• Naturally aspirated LS swaps
• Vehicles producing up to 450 HP

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BUILT TO ORDER

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Every Twisted Street™ 4L60E is built for the specific vehicle and intended use.

Before assembly, we verify:

• Year, make and model
• Engine
• 2WD or 4WD
• Bellhousing design
• Input shaft and converter design
• Speed-sensor type
• Output shaft and extension housing
• Tire size
• Gear ratio
• Vehicle modifications
• Intended use

This listing covers multiple 1998–2012 4L60E designs. Internal and external parts vary by year and application.

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AVAILABLE CONFIGURATIONS

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• 2WD
• 4WD
• GM truck and SUV
• GM van
• LS swap
• Specialty applications

Corvette, F-body and specialty applications may require different parts or additional charges.

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INSTALLATION REQUIREMENTS

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The transmission cooler and cooler lines must be properly flushed or replaced before installation.

The vehicle must also have:

• Correct transmission fluid level
• Proper cooler flow
• Working engine and transmission grounds
• No engine misfires
• Correct PCM calibration
• Correct tire-size and gear-ratio programming
• Proper converter lockup control
• Correct driveshaft length and driveline angles

Vehicle problems can damage a new transmission and are not considered transmission defects.

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Drive With Confidence™

Built Tough. Built Twisted.

Twisted Torque™ Performance Transmissions