How much transmission fluid does a 2007 Chevy 3500 Allison take?
The amount of transmission fluid you’ll need depends on the service you’re performing. For a complete fluid replacement including the torque converter, plan on roughly 25–28 quarts. For a simple pan drop with a filter change, expect about 14–18 quarts. Exact requirements can vary by VIN and service method, so verify with the GM service manual or dealer data for your truck.
This article explains the typical capacities for the 2007 Chevy Silverado 3500HD equipped with the Allison 1000 automatic, along with guidance on fluid type, service practices, and how to check the level accurately. It’s written to help you plan maintenance without surprises while acknowledging that individual vehicles may differ slightly.
Estimated transmission fluid capacity
Capacities vary by service type. The figures below reflect common values for the 2007 Silverado 3500HD with the Allison 1000 and are meant as targets for planning maintenance.
- Complete transmission fluid replacement (including torque converter): about 25–28 quarts (approximately 24–27 L).
- Pan drop with filter replacement (no torque converter drain): about 14–18 quarts (approximately 13–17 L).
In practice, you’ll often see a midrange figure cited for planning: roughly 26 quarts for a full replacement and about 16 quarts for a standard drain-and-fill. Always confirm the exact specification for your VIN from GM's service data or the dealership.
Fluid type and service tips
The 2007 Allison 1000 in GM trucks typically requires a Dexron VI-compatible ATF or an Allison TES-389 compliant fluid. Always check the owner’s manual or GM service documentation for the precise specification for your VIN, and avoid mixing fluid types. When performing a drain and fill, replace the transmission filter and use a new pan gasket if required. For a full replacement, plan for additional fluid to account for the torque converter and any fluid that remains in the system.
How to check the transmission fluid level
Check the level once the transmission is at proper operating temperature (usually after warming up on a drive). With the engine running and the vehicle in Park on a level surface, read the dipstick marks to ensure the level is within the hot range. If low, add small amounts of Dexron VI (or the specified fluid) in small increments, rechecking until the level stabilizes within the hot marks. Do not overfill, as an overfilled transmission can foaming and damage.
Summary
For the 2007 Chevy Silverado 3500HD with the Allison 1000, plan on roughly 25–28 quarts for a full fluid replacement (including the torque converter) and about 14–18 quarts for a simple pan drop with a filter change. Fluid type should align with GM specs (Dexron VI or TES-389 compliant ATF). Always confirm exact capacities for your VIN in the service manual and follow proper procedures to check the level after service.
