How many quarts of transmission fluid is needed for the Dually Model? on 2002 Chevrolet Silverado 3500

I need to know how many quarts of transmission fluid is needed on my 2002 Chevrolet Silverado 3500 Diesel Duramax 6.6L V8 Diesel Turbo Dually?

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1 answer 2 comments
DO YOU HAVE AN ALLISON OR 4L60E OR 4L80E TRANS
Allison
are you just doing a service or is completely empty?