The 2009 Chevrolet Silverado 4x4 typically uses a two-speed transfer case in the NV246/NP246 family. If the truck is 2WD, there is no transfer case. Exact suffixes can vary by option and production run, so check the case tag or build sheet to confirm.
Overview of the 2009 Silverado drivetrain configurations
During the 2009 model year, the Silverado offered two primary drivetrain setups: rear-wheel drive (2WD) and four-wheel drive (4WD). The 4WD versions use a two-speed transfer case to provide high and low range for off-road or challenging road conditions. The standard unit used in most 4WD Silverado models from this era is part of the NV246/NP246 family, with variations depending on options and production specifics.
Common transfer-case designations you might see
Because GM catalogs sometimes reference slightly different suffixes for the same unit, the transfer case most often identified for 2009 Silverado 4x4 models is the NV246 (also listed as NP246 or NP246C in some service documents). This is a two-speed case used for high and low range 4WD operation. The exact suffix can vary by vehicle configuration and documentation.
- 2WD Silverado: does not include a transfer case.
- 4WD Silverado: uses a two-speed NV246/NP246 family transfer case for high/low range operation.
In short, if your Silverado is equipped for 4WD, you’re most likely dealing with an NV246/NP246 two-speed transfer case; 2WD trucks omit the transfer case entirely.
How to identify the exact transfer case on your truck
To confirm the exact transfer case model in your specific vehicle, use one or more of these checks:
- Inspect the transfer case identification tag on the case itself; it will show the model (for example, 246 or 246C) and sometimes a suffix.
- Check the vehicle’s build sheet or VIN on GM’s service portal or dealer system to verify the original equipment transfer-case code.
- Compare the shift mechanism (electronic shift vs. manual lever) and control options to known configurations for NV246/NP246-equipped trucks.
Verifying the exact code helps ensure you source correct fluid types, replacement parts, and service procedures.
Maintenance and common issues
Like other transfer cases, the NV246/NP246 benefits from regular fluid changes and seal inspections. Common issues on aging units can include fluid leaks from seals, drivetrain noise from worn gears or chain, and actuator motor or wiring faults on electronically shifted versions.
- Replace transfer-case fluid at the intervals recommended by GM with the specified fluid for NV246/NP246 cases.
- Inspect for leaks around the case seals and at the input/output seals.
- Test shift functions (2Hi/4Hi/4Lo) for proper engagement and smooth operation; address any binding or slipping promptly.
Proactive maintenance helps prevent more serious failures and keeps 4WD functioning reliably.
Summary
For a 2009 Silverado, the transfer case is present only on 4WD models and is typically the two-speed NV246/NP246 family. 2WD trucks do not have a transfer case. To determine the exact suffix on your vehicle, check the transfer case tag or consult the build sheet or GM’s service resources.