4L80E Stage 1 Diesel Transmission
Heavy-Duty Diesel • Towing • Plowing • Work Applications
Fits GM 4L80E Diesel Applications (1991–2009)
Built for diesel torque, reliability, and daily work use.
This Stage 1 4L80E diesel transmission is designed for GM diesel-powered trucks and
vans used in towing, plowing, hauling, and general work-duty service.
This build focuses on durability, proper clutch holding capacity, and stable shift
control for diesel torque output rather than high-RPM performance.
This is not a stock rebuild.
This is a heavy-duty diesel transmission built for work.
Internal Components & Upgrades
- 1800–2200 stall heavy-duty diesel torque converter included
- High-energy diesel-spec friction materials
- New steel clutch plates
- New HD Pro Plus band
- Heavy-duty sprag assembly
- Complete new bushing set with no-walk bushings
- Heavy-duty remanufactured pump with all factory updates
- All factory updates installed
Hydraulics, Pump & Valve Body
- Superior Stage 1 shift kit calibrated for diesel towing and work use
- Automatic valve body configuration
- Stable, predictable shift control under load
New Internal Electronics Package
- New internal wiring harness
- New EPC solenoid
- New shift solenoids (as applicable)
- New pressure control components as required
Cooling & Service Requirements
- External auxiliary transmission cooler strongly recommended
- High-volume transmission filter included
- Proper cooling required for towing and plowing applications
Vehicle Fitment & Core Selection
Fits GM vehicles originally equipped with the 4L80E diesel automatic
from 1991–2009, including 6.2L and 6.5L diesel applications.
The correct transmission core is selected and built based on vehicle year,
engine configuration, drivetrain, and intended use.
Warranty & Build Standards
- Fully disassembled and rebuilt
- All wear components replaced with new parts
- Internally upgraded for diesel torque output
- 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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