2008 GMC Sierra Transmission Fluid Capacity: A Blunt Guide

2008 GMC Sierra Transmission Fluid Capacity

When it comes to maintaining your 2008 GMC Sierra, one important aspect that often gets overlooked is the transmission fluid. Properly maintaining the transmission fluid is crucial for the smooth operation and longevity of your vehicle’s transmission. In this article, we will discuss the transmission fluid capacity for the 2008 GMC Sierra and provide you with the blunt and straightforward information you need to keep your truck running smoothly.

Transmission Fluid Capacity and Type

Before we dive into the transmission fluid capacity, let’s first talk about the type of fluid you should be using. For the 2008 GMC Sierra, the recommended transmission fluid is Dexron VI. It is important to use the specified fluid to ensure optimal performance and avoid any potential damage to the transmission.

Now, let’s get to the capacity. The 2008 GMC Sierra with a 4-speed automatic transmission has a transmission fluid capacity of approximately 12 quarts or 11.4 liters. This capacity includes the fluid required for the transmission pan, torque converter, and cooler lines.

It is important to note that the fluid capacity may vary slightly depending on the specific model and any modifications made to the vehicle. Therefore, it is always a good idea to consult your owner’s manual or contact a GMC dealership to confirm the exact fluid capacity for your particular Sierra.

Transmission Fluid Replacement

Now that you know the transmission fluid capacity for your 2008 GMC Sierra, let’s discuss the process of replacing the fluid. While it is always recommended to have a professional mechanic perform this task, if you are confident in your abilities and have the necessary tools, you can attempt it yourself. However, please keep in mind that working on your vehicle carries some risks, and any mistakes can lead to costly repairs or even accidents.

  1. Start by parking your Sierra on a level surface and engaging the parking brake.
  2. Locate the transmission fluid dipstick, which is usually labeled and can be found near the back of the engine bay.
  3. Remove the dipstick and use a funnel to add the appropriate amount of transmission fluid, based on the capacity mentioned earlier.
  4. Check the fluid level using the dipstick and add more fluid if necessary. Be careful not to overfill, as it can cause damage to the transmission.
  5. Once you have reached the proper fluid level, securely reinsert the dipstick and start the engine.
  6. Allow the engine to idle for a few minutes to warm up the transmission fluid.
  7. With the engine still running, shift through each gear position, pausing for a few seconds in each, including reverse and park.
  8. Return the gear selector to park and recheck the fluid level using the dipstick. Add more fluid if needed.
  9. Finally, take your Sierra for a short test drive to ensure the transmission is shifting smoothly.

Remember, if you are unsure about performing the transmission fluid replacement yourself, it is always best to seek the assistance of a qualified mechanic. They have the knowledge and experience to complete the task safely and efficiently.


Now that you have the blunt and straightforward information about the transmission fluid capacity for your 2008 GMC Sierra, you can ensure that your truck’s transmission stays in top shape. Remember to use the recommended Dexron VI fluid and follow the proper procedures for fluid replacement. By taking care of your transmission, you can enjoy a smoother and more reliable driving experience for years to come.

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