The 2007 GMC Sierra 1500 predominantly uses a GM automatic transmission: most trucks came with a 4-speed automatic (4L60-E), while a 6-speed automatic (6L80) was available on certain configurations.
Transmission options for the 2007 Sierra 1500
GM offered two automatic transmissions across the model year, with the choice depending on engine and trim level.
- 4L60-E 4-speed automatic: standard on most Sierra 1500 configurations (4.3L V6, 4.8L V8, 5.3L V8).
- 6L80 6-speed automatic: optional on select configurations, typically paired with a larger V8 engine or heavy-duty equipment.
In practice, the vast majority of 2007 Sierra 1500s used the 4L60-E, while the 6L80 was available on specific builds.
How to confirm which transmission your truck has
To verify your vehicle’s transmission, check official build information and the physical components.
- Inspect the vehicle’s door jamb tag or VIN-based build sheet for transmission details.
- Examine the transmission pan and related markings to identify the model (4L60-E vs 6L80).
- Consult GM’s service portal or a dealer with the VIN to confirm the exact factory-installed transmission.
- Ask a certified mechanic to verify the transmission code during a full inspection.
These steps help ensure you know whether your Sierra 1500 is equipped with the 4L60-E or the 6L80, which matters for maintenance and parts compatibility.
Notes on maintenance and parts compatibility
Both transmissions require proper fluid maintenance and periodic checks, but the 6L80 uses different fluid specifications and service intervals than the 4L60-E. Always use the recommended GM fluids and filters for your model year and transmission code.
Summary: The 2007 GMC Sierra 1500 typically uses a 4-speed automatic (4L60-E), with a 6-speed automatic (6L80) available on certain configurations. Confirm the exact transmission via build information or VIN, and follow the manufacturer’s maintenance guidelines for your specific model.