How much transmission fluid does a Chevy 3500 take?
The transmission fluid capacity on a Chevy 3500 depends on the exact transmission installed. For common Silverado 3500HD configurations, a simple drain-and-fill typically uses about 12 to 15 quarts, while a full system flush can require roughly 25 to 32 quarts. Always verify the exact figure for your year and model in the owner's manual or GM service data.
The Silverado 3500 line includes both gasoline-powered models with Hydra-Matic automatic transmissions and diesel models paired with the Allison automatic. Because fluid type and capacity vary between these transmissions, the following guide provides approximate ranges and how to confirm the precise amount for your vehicle.
Transmission options and their approximate total capacities
Before listing the typical capacities, note that the exact number depends on the transmission type, pan size, and whether you count the torque converter. The ranges below reflect common configurations found in 3500-series trucks.
- Gasoline engine with Hydra-Matic 6L80 or 6L90: roughly 12–15 quarts of total system capacity
- Duramax diesel with Allison 1000: roughly 25–32 quarts of total system capacity
These figures refer to the entire transmission system. Actual fill requirements can vary if you are performing a simple drain-and-fill versus a complete flush, or if you replace the filter and service hardware.
Drain-and-fill versus full flush: what to plan for
To replace transmission fluid, you can do a straightforward drain-and-fill or opt for a more thorough flush. The volumes below are approximate and can vary by year and model; always verify with the service data for your exact truck.
- Drain-and-fill (pan drain with filter change, no torque converter removal): typically about 6–12 quarts for the 6L80/6L90 configurations; about 15–22 quarts for the Allison 1000 configurations
- Full flush (replacing virtually all fluid, including torque converter): roughly 14–18 quarts for the 6L80/6L90 setups; about 25–32 quarts for the Allison 1000 setups
Because these are broad ranges, you may not need all of the listed fluid. Use the dipstick or level check as you fill, and avoid overfilling, which can cause foaming and operational issues.
How to check and fill safely
Always start with the correct fluid specification and a clean workspace. For most GM automatics, fluid type depends on the transmission: Dexron VI for many GM bases and TES-295 for Allison transmissions. Here’s how to check and fill correctly:
- Warm up the engine and transmission by driving briefly, then park on a level surface.
- With the engine running and in Park (and the parking brake engaged), locate the transmission dipstick (or follow GM service procedure for dipstickless systems).
- Check the current fluid level and condition. If it's dark or has a burnt odor, consider a change rather than a quick top-off.
- If adding fluid, do so slowly in small increments, checking the level frequently to avoid overfilling.
- After adding, cycle through the gears (Park, Reverse, Neutral, Drive, and back to Park) to circulate the fluid, then re-check the level once again with the engine idling and warm.
Always use the fluid type specified for your year and transmission. If in doubt, consult the owner's manual or a Chevrolet/GMC dealer service department.
Fluids to use
Use the fluid types recommended for your transmission. The general guidance is:
- GM automatic transmissions (6L80/6L90): Dexron VI
- Allison transmissions (Allison 1000): TES-295 or other OEM-specified fluid
When in doubt, verify the exact specification in your owner's manual or with a GM service professional, as using the wrong fluid can cause shifting issues or damage.
Summary
The Chevy 3500’s transmission fluid capacity varies by transmission type: about 12–15 quarts total for many gasoline-equipped 6L80/6L90 models, and about 25–32 quarts for Duramax diesels with Allison 1000. Drain-and-fill and full flush procedures require different volumes, so always confirm the exact capacity for your year/model and use the correct fluid specification (Dexron VI or TES-295) as directed. Planning ahead with the manual and having a little extra fluid on hand will help ensure a proper, safe refill.
How much fluid does a 6.6 Duramax Allison transmission hold?
What is the Oil Capacity of a Duramax? The 6.6 liter Duramax oil capacity is 10 quarts — a massive amount of oil.
What kind of transmission fluid does a 2005 Chevy 3500 take?
1 quart. DEXRON-VI Automatic Transmission Fluid (ATF).
How much transmission fluid does a Chevy 3500 hold?
10 speed Trans Only 10-SPD/MGM Total Fill 20.6 quarts. Capacity: 14.4 quarts Initial Fill.
How much transmission fluid does a 2015 Silverado 3500 hold?
Automatic Transmission Fluid
Capacity: 6 speed 1000 Total Fill 12.7 quarts. Capacity: 7.4 quarts Initial Fill.
