Here's the catch: The exact Allison transmission fluid your truck needs depends on the specific Allison transmission model you have. Here's how to figure it out:
1. Locate your transmission identification (ID) tag. This is usually located on the transmission itself, often on the passenger side.
2. Find the 6 or 7 digit code on the tag. This code is the key to finding the correct fluid.
3. Use the code to look up the recommended fluid. You can use online resources like the Allison Transmission website ([https://www.allisontransmission.com/](https://www.allisontransmission.com/)), the owner's manual, or consult a local transmission shop.
General Recommendations:
* Allison TES-295: This is a common fluid for older Allison transmissions, but it's crucial to verify if it's compatible with your specific model.
* Allison TES-449: This is a more advanced fluid for newer models and provides improved performance and longevity.
Remember: Using the incorrect fluid can result in transmission problems like slipping, overheating, and premature wear.
Important Tip: Before changing the fluid, it's always a good idea to consult the owner's manual for the specific recommendations for your truck and transmission.
