4L80E - 4L85E

4L80E / 4L85E Performance Torque Converters
The modern heavy-duty favorite, built in Dearborn.

The 4L80E (and its higher-capacity 4L85E sibling) has become one of the most popular overdrive transmissions in modern performance and racing. Built on the legendary TH400 architecture with an added overdrive and electronic control, it’s the go-to choice for high-horsepower street cars, turbo builds, and serious drag racing applications that still need to be driven.

Dearborn Precision Performance Parts builds high-performance stall converters specifically for these transmissions. Every unit is engineered and assembled in Dearborn with thorough TIG-welding on the impeller and turbine, heavy-duty sprags, USA-made bearings, high-energy clutch materials, and CNC-machined components.

The result is consistent flash stall, strong power transfer, and the durability these high-torque applications demand.

What you’ll find here:

  • Street and strip stall ranges (2500–4000+ RPM options)
  • Converters built for both street manners and serious power levels
  • Precision balanced and tested units ready for installation

Whether you’re running a high-horsepower street machine, a turbo build, or a dedicated race car, these 4L80E and 4L85E converters are made in the 313 to dominate Detroit streets and win out at Milan Dragway.