4L80E Stock / OEM+ Diesel Transmission
350–450 HP Rated • Stock Replacement • Towing • Daily Work Use
Fits GM Diesel Vehicles Originally Equipped with the 4L80E (1991–2009)
Built for reliability, longevity, and everyday diesel work.
This 4L80E Stock / OEM+ diesel transmission is designed for GM diesel trucks and vans
used for daily driving, towing, light hauling, and work applications where factory-level
performance and durability are required.
Rated for 350–450 horsepower maximum, this build incorporates select
upgrades over a basic stock rebuild to improve reliability while retaining OEM shift
quality and drivability.
This is not a performance or race transmission.
This is an upgraded stock replacement built for dependable service.
Included Components & Upgrades
- Stock replacement torque converter included
- High-energy diesel-spec friction plates
- New steel clutch plates
- New intermediate band
- Complete new bushing set with no-walk bushings
- Heavy-duty sprag assembly
- Remanufactured pump assembly with all factory updates
- Shift improver kit calibrated for smooth OEM-style operation
- New internal electronics package
- New high-volume transmission filter
Hydraulics, Pump & Valve Body
- Automatic valve body configuration
- Factory-correct shift timing and pressure
- All known factory updates installed
Vehicle Fitment & Core Selection
Fits GM diesel vehicles originally equipped with the 4L80E automatic transmission
from 1991–2009.
The correct transmission core is selected and built based on year, engine configuration,
and drivetrain to ensure proper fitment and operation.
Warranty & Build Standards
- Fully disassembled and rebuilt
- All wear components replaced with new parts
- Upgraded beyond basic stock rebuild standards
- Inspected and tested prior to shipment
- 2-Year Warranty / Unlimited Mileage (see warranty terms)
All Transmission Depot transmissions are built, calibrated,
and quality-checked by Twisted Torque™.
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