The GMC Acadia is a versatile mid-size SUV that delivers comfort, space, and performance. Like any vehicle, proper maintenance is key to long-term reliability—and one of the most important but often overlooked services is changing the transmission fluid. Using the right fluid type and capacity ensures smooth shifting, prevents overheating, and extends transmission life. This guide covers the GMC Acadia transmission fluid capacity for different model years and transmissions, plus the recommended fluids and DIY tips.
Quick Answer – Transmission Fluid Capacity
- 2007–2016 GMC Acadia (6-speed automatic 6T75/6T70): ~11.4 quarts (full fill) – Dexron VI ATF
- 2017–Present GMC Acadia (9-speed automatic 9T65): ~9 quarts (full fill) – Dexron VI ATF
- Drain & Fill Service: Typically replaces 4–5 quarts depending on transmission and year
Recommended Transmission Fluids
- ACDelco Dexron VI Automatic Transmission Fluid – Official GM factory fluid for Acadia transmissions.
- Castrol Transmax Dexron VI ATF – Trusted aftermarket alternative with GM Dexron VI approval.
- Valvoline Dexron VI/Mercon LV Full Synthetic ATF – Budget-friendly, widely available, and GM-approved.
Why Transmission Fluid Matters
Transmission fluid isn’t just a lubricant—it’s also a coolant and hydraulic fluid that allows your transmission to shift smoothly. Using the wrong type of fluid can cause:
- Slipping or hard shifting
- Overheating
- Premature wear and transmission failure
That’s why GM specifies Dexron VI ATF for the GMC Acadia. It offers improved stability, anti-foaming properties, and better protection than older Dexron III formulations.
DIY Transmission Fluid Change – Basic Steps
If you’re considering changing the fluid yourself, here’s a simple process:
- Warm up the engine and transmission with a short drive.
- Lift and safely support the vehicle.
- Place a drain pan under the transmission and remove the drain plug (if equipped).
- Let the old fluid drain completely.
- Reinstall the plug with a new washer if necessary.
- Remove the transmission pan if replacing the filter (on some models).
- Refill through the transmission dipstick or fill plug with the correct amount of Dexron VI.
- Start the vehicle, shift through all gears, and check the fluid level.
GMC Acadia Transmission Fluid Capacity by Year
| Model Years | Transmission | Drain & Fill | Full Capacity | Fluid Type |
|---|---|---|---|---|
| 2007–2016 | 6T75 / 6T70 (6-speed automatic) | 4–5 quarts | ~11.4 quarts | Dexron VI |
| 2017–Present | 9T65 (9-speed automatic) | 4–5 quarts | ~9 quarts | Dexron VI |
FAQ Section
How often should I change transmission fluid in a GMC Acadia?
GM recommends inspecting the transmission fluid regularly and changing it around 60,000–100,000 miles depending on driving conditions. Heavy towing or city driving may require earlier service.
Can I use Dexron III instead of Dexron VI?
No, GM requires Dexron VI for the Acadia. Dexron VI is backward-compatible with older transmissions, but Dexron III should not be used in place of Dexron VI.
Does the GMC Acadia have a transmission dipstick?
Most newer models have a sealed transmission without a traditional dipstick. Fluid level must be checked via a fill plug at a specific temperature.
How much fluid is replaced in a drain & fill?
Only about 4–5 quarts are replaced since the torque converter and cooler lines retain fluid. A full capacity refill requires transmission disassembly or flushing.
What happens if I overfill the transmission?
Overfilling can cause foaming, overheating, and erratic shifting. Always fill to the recommended level only.
Conclusion
The GMC Acadia transmission fluid capacity ranges from 9 to 11.4 quarts depending on the model year and transmission. Both the 6-speed (2007–2016) and 9-speed (2017–present) use Dexron VI ATF. A drain and fill will typically replace 4–5 quarts, while a full overhaul requires the total capacity. Keeping your Acadia filled with the correct fluid at the proper level ensures smoother shifts, better cooling, and long-term reliability. Order GM-approved Dexron VI fluid today and protect your transmission.
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