What is the Allison transmission capacity for a 05 Chevy silverado 2500hd with 6.6 turbo diesel?

The 2005 Chevy Silverado 2500HD with the 6.6L Duramax turbo diesel engine came with either an Allison 1000 or an Allison 545R transmission. There isn't a single capacity number because the actual fluid capacity varies slightly depending on whether the transmission is drained completely or just the pan is dropped. You also need to consider whether you are adding just the filter or doing a complete transmission fluid and filter change.

To find the precise capacity for your specific transmission:

* Check your owner's manual: This is the best source of information. It will specify the correct fluid type and the capacity for your particular truck.

* Consult an Allison Transmission resource: The Allison Transmission website might have service manuals or capacity charts based on the transmission identification number (found on a tag on the transmission itself).

* Check a reputable repair manual: Repair manuals like those from Haynes or Chilton often include transmission fluid capacity information.

Without knowing precisely which Allison transmission (1000 or 545R) is in your truck, I cannot provide a definitive answer. Expect the capacity to be somewhere in the range of 10-14 quarts for a complete fluid and filter change. Always refer to your owner's manual or a reliable service manual for the exact amount needed.