4L80E HD Diesel Transmission – Stage 2
650 HP Rated • Heavy-Duty Diesel • Towing • Plowing • Hauling
Fits GM 6.2L & 6.5L Diesel Engines (1991–1996)
Built for diesel torque, sustained load, and real work.
This Stage 2 4L80E HD Diesel transmission is engineered specifically for GM 6.2L
and 6.5L diesel applications used for towing, plowing, hauling, and heavy-duty
work service.
Rated for up to 650 horsepower, this build focuses on torque handling,
clutch capacity, and durability under continuous load rather than high-RPM
race use.
This is not a stock rebuild.
This is a heavy-duty diesel transmission built for work.
Internal Components & Upgrades
- Master overhaul kit with all new seals and gaskets
- Heavy-duty high-energy diesel-spec friction materials
- Kolene-treated steel plates
- Extra-capacity clutch assemblies for improved torque holding
- New HD Pro Plus band
- 34-element heavy-duty intermediate sprag
- Heavy-duty sprag assembly
- Updated direct clutch piston
- Billet reverse servo
Hard Parts, Bushings & Support Components
- Heavy-duty input shaft
- Complete new bushing set with no-walk bushings
- New thrust washer set
Hydraulics, Pump & Valve Body
- Heavy-duty remanufactured pump with all factory updates
- TransGo HD shift kit calibrated for diesel towing and work use
- Improved pressure stability under sustained load
- Automatic valve body configuration
New Internal Electronics Package
- New internal wiring harness
- New EPC solenoid
- New shift solenoids
- New pressure control components as required
Torque Converter Included
- 2800 stall heavy-duty performance torque converter included
- Designed for diesel torque characteristics
- Optimized for towing, plowing, and heavy vehicles
Cooling & Tuning Requirements
- External auxiliary transmission cooler required
- Factory cooler alone is not sufficient for heavy-duty diesel use
- Proper transmission tuning recommended for load control and longevity
Vehicle Fitment & Core Selection
Fits GM vehicles equipped with the 4L80E and 6.2L or 6.5L diesel engines
from 1991–1996.
The correct transmission core is selected and built based on vehicle year,
engine configuration, drivetrain, and intended work use.
Warranty & Build Standards
- Fully disassembled and rebuilt
- Internally upgraded for heavy-duty diesel service
- All factory updates installed
- Tested and inspected prior to shipment
- 3-Year Warranty / Unlimited Mileage (see warranty terms)
All Transmission Depot transmissions are built, calibrated,
and quality-checked by Twisted Torque™.
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