The majority of 2008 Silverado 1500 4x4 models use a GM 4L60-E four-speed automatic transmission, with a six-speed automatic (the 6L80 family) used on some 6.0L V8 configurations.
In more detail, the exact transmission depends on the engine and options installed by the factory. The common 4x4 lineup offered engines such as the 4.3L V6, 4.8L V8, and 5.3L V8 that typically paired with the 4L60-E four-speed automatic. A subset equipped with the 6.0L V8 used a six-speed automatic (6L80/6L90 family) in that model year. No manual transmission was offered on the 1500 models in 2008. For absolute certainty, check the vehicle’s VIN, window sticker, or built sheet.
Typical engine-transmission pairings
The following listings reflect the common configurations across the 2008 Silverado 1500 4x4 lineup. Variations can occur due to production changes or optional equipment.
- 4.3L V6: GM 4L60-E four-speed automatic
- 4.8L V8: GM 4L60-E four-speed automatic
- 5.3L V8: GM 4L60-E four-speed automatic
- 6.0L V8: GM 6L80 six-speed automatic
In short, the 4L60-E was the standard transmission for most 2008 Silverado 1500 4x4 trucks, while the 6L80-series six-speed automatic appeared with the 6.0L V8 option. Always verify the exact configuration on a given truck via the VIN or build sheet.
How to verify your truck’s transmission
To confirm the exact transmission in your vehicle, use these verification methods. The list below covers practical steps you can take to identify the transmission installed in a specific truck.
- Check the transmission itself for a model stamp such as “4L60-E” or “6L80” on the nameplate, pan, or casing.
- Inspect the glovebox or door jamb build sheet or the window sticker for transmission details or RPO codes.
- Decode the vehicle identification number (VIN) with a GM decoder or by consulting the dealer to confirm the drivetrain and transmission option.
- Consult the owner’s manual or a service report from a dealer or a reputable aftermarket shop that can verify the transmission type from the VIN.
These steps help ensure you’re referencing the exact transmission on a given 2008 Silverado 1500 4x4, which is especially important when ordering parts or planning maintenance and potential upgrades.
Summary
For the 2008 Chevy Silverado 1500 4x4, the standard transmission was typically the 4L60-E four-speed automatic behind the 4.3L V6 and most V8 engines. A six-speed automatic (6L80-series) was used with the 6.0L V8 option. To know the precise transmission in a specific truck, verify via VIN, build sheet, or window sticker, as configurations varied by option and production run.