The Silverado first got the 6L80E in the 2007 model year. GM introduced the six-speed automatic across its full-size pickups in the mid-2000s, and the Silverado 1500 began offering the 6L80E with its V8 engines starting in 2007, with broader adoption in the following years.
Background: what the 6L80E is
The 6L80E is GM's six-speed automatic transmission that debuted in the mid-2000s to replace older four-speed designs in many trucks and SUVs. It was designed to handle the higher torque demands of GM’s full-size pickups and their larger V8 engines, and it saw widespread deployment across the Silverado/Sierra line and related SUVs.
Which Silverado models used it
GM rolled the 6L80E out primarily on Silverado 1500 models equipped with larger V8 engines. Over successive model years, more trims and configurations were offered with the 6L80E as GM updated the lineup. Availability could vary by cab configuration, bed length, and drivetrain (2WD vs. 4WD).
Note on variation by year and configuration
As with many powertrain updates, the 6L80E did not appear uniformly across every 2007 Silverado configuration. Its adoption expanded over the following years, with broader use entering the early 2010s as GM refreshed its truck lineup and transitioned to newer transmission families in later generations.
Summary
The Chevrolet Silverado began offering the GM 6L80E six-speed automatic in the 2007 model year, with broader adoption through the early 2010s as part of GM’s ongoing updates to its full-size truck lineup.