4L80E GM Extreme Street & Strip Transmission
850 HP Rated • Extreme Street • Street/Strip • Heavy-Duty Performance
Extreme strength. Precise control. Built for serious power.
This 4L80E extreme street and strip transmission is engineered for high-horsepower
applications that exceed the limits of standard heavy-duty and 650 HP performance builds,
while remaining suitable for aggressive street, street/strip, and heavy-duty use.
Rated for up to 850 horsepower, this build incorporates critical billet
load-bearing components, premium performance friction, and reinforced internal upgrades
designed to survive high torque, shock loads, and sustained heat.
This is not a mild performance transmission.
This is not a race-only build.
Key Design Features
- Designed for high-horsepower street and strip applications
- Critical billet load-bearing upgrades for extreme torque capacity
- 300M billet input shaft for high shock-load resistance
- Billet overdrive planetary assembly to eliminate factory failure points
- Billet forward clutch hub for increased durability
- More aggressive hydraulic calibration than 650 HP builds
Internal Components & Upgrades
- Premium performance friction materials and steel plates
- Heavy-duty master overhaul kit with all new seals and wear items
- Upgraded bushing and support system for alignment and oil control
- High-volume transmission filter
- Complete thrust washer set for end-play control
- High-temperature hydraulic components for sustained heat resistance
Hydraulics, Pump & Valve Body
- Pump calibrated for higher line pressure and clutch apply force
- Valve body configured for faster, firmer shifts under load
- Extreme street/strip shift calibration
- New EPC solenoid
- New 1–2 and 2–3 shift solenoids
- New internal wiring harness
- All applicable factory updates installed based on selected core
Extreme-Duty Hard Parts Package
- 300M billet input shaft
- Billet forward clutch hub
- Billet overdrive planetary assembly
- Heavy-duty sprag assembly for high-shock launches
- Upgraded case and stator support bushings
Torque Converter Requirement
Torque converter not included.
At this power level, a properly matched performance torque converter is required.
Converter selection must account for engine output, torque curve, vehicle weight,
power adders, gearing, and intended use.
Correct converter selection is critical for reliability and warranty consideration.
Cooling & Tuning Requirements
- External auxiliary transmission cooler required
- High-capacity cooling recommended for sustained high-load use
- Proper ECU / TCM tuning required to match engine output
- Improper cooling or tuning may result in premature failure
Vehicle Fitment & Core Selection
Fits GM vehicles equipped with the 4L80E from 1991–2006.
Each transmission is built from the correct GM core selected based on
vehicle year, make, model, engine configuration, drivetrain, and intended use.
This listing covers all 4L80E applications within these model years.
Build Standards
- Fully disassembled and rebuilt
- Internally upgraded for extreme power applications
- Application-matched configuration
- Individually inspected and tested
- USA-assembled by experienced builders
All Transmission Depot transmissions are built, calibrated,
and quality-checked by Twisted Torque™.
