Duramax Allison transmission fluid change

[OKI Marine]

I bought the fluid and filter package from Duramax store.com. The site recommended that the fluid change would be about 7.4 quarts. Has anyone done this on their Allison transmission? Is that what goes into the pan or does that include the filter fill as well. Do I check fluid fill twice with one at cold and one hot?

[cajun225]

It can take up to 9 quarts to fill a Allison. Start with 7 quarts then start your engine and check the fluid. Make sure its to the cold mark. Once at the cold mark take you truck on the road for a 1 or 2 miles the recheck and make sure its at the hot mark. DO NOT start your truck until you put all 7 quarts in or you could set code and make the trans go into limp mode. Also when you replace the spin on filter make sure you put the magnet back on it. Just so you know I am a foreman at a large GM.

[OKI Marine]

Sounds great. Thanks for the advice