6L80E / 6L90E
Inside Our Level 4 6L80E: As Featured in All Chevy Performance
The November 2026 issue of All Chevy Performance takes readers inside our shop to follow a Level 4 6L80E from bare case to finished transmission. Writer...
6L80 Transmission 4x4 vs 6L80 Transmission 2WD: What’s The Difference
If you've spent any time planning a late-model GM swap or sourcing a replacement unit for a truck build, you've probably run into the 6L80 pretty...
Essential 6L90 Transmission Upgrades
If there’s one thing GM got right with the 6L90 transmission, it’s that they built it to survive real work. Found behind heavy-duty trucks, performance...
6L80E and 6L90E Transmission Specs and Identification
The 6L80E and the 6L90E are close enough that people mix them up constantly, and different enough that putting the wrong one in a heavy truck is an...
Upgrading Your 6L80 Torque Converter: Performance and Benefits
SUMMARY: The 6L80 transmission, a reliable 6-speed GM system, can develop performance issues due to its stock torque converter’s wear. Upgrading to a...
6L80E Transmission Specs and Identification
The arrival of 6L80E transmissions – or Hydra-Matic 6L80 transmissions – on the automotive scene in 2006 showcased the considerable design change of the...
6L80 vs 6L90: Devil's in the Details
The 6L80 and 6L90 are two of the most popular rear-wheel transmissions from General Motors. So many things have been discussed about these remarkable...