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Discussion Starter · #1 ·
i have 05 with the allison 5 speed.i was going to do a fluid change on it my self. how much fluid does it take and what fluid do you guys think is best
 

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Pan drain only 7.5 qts, add 2.5 qts for deep pan

Full flush 12.5 qts, add 2.5 qts for deep pan

These are estimates that I have I accumulated through various threads, but seem to be the norm. I just did a deep pan drain and flush and used 4 gallons.
 

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Discussion Starter · #3 ·
the truck has 55000 miles on it and the fluids been changed once.should i drain it are flush it
 
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