The 2008 Toyota Sienna uses a five-speed automatic transmission with electronic control (ECT-i). It is not a manual or CVT; both front-wheel-drive and all-wheel-drive versions use this same automatic transmission.
Overview of the transmission configuration
The Sienna relies on a traditional torque-converter automatic design with five forward gears and electronic shift logic to optimize performance and fuel economy. Toyota’s ECT-i system adjusts gear changes based on speed, load, and driving conditions.
Gear count and driving conditions
With five forward gears, the transmission provides a balance of responsive city driving and efficient highway cruising, with overdrive helping to improve fuel economy on long trips.
Drivetrain options
Both front-wheel drive (FWD) and all-wheel drive (AWD) configurations were offered for the 2008 Sienna, and both rely on the same five-speed automatic transmission.
- Five-speed automatic transmission with electronic control (ECT-i).
- Standard front-wheel drive (FWD); optional all-wheel drive (AWD).
- Not a manual or CVT; shifting is automatic.
The following points summarize the core transmission setup and options for the 2008 Sienna:
In practice, the two drivetrain configurations share the same transmission family, with AWD adding traction-related components separate from the transmission itself.
Maintenance considerations
To keep the transmission performing well, follow Toyota’s recommended maintenance schedule for automatic transmissions, regularly check fluid level and condition, and address any shifting irregularities promptly with a qualified technician.
Summary
The 2008 Toyota Sienna uses a traditional five-speed automatic transmission with electronic control (ECT-i). It is available with either front-wheel drive or optional all-wheel drive and is not a manual or CVT. Regular maintenance helps ensure long-term reliability.