what kind of transmission does your Jeep have? model and year? need info to answer this its not a one size fits all type deal. I have the AW4 4 speed auto on a jeep Cherokee and just draining the pan I need to replace around 3 quarts of Dex/Merc III type fluid. doing a full system flush would require more but unless you do the transmission pump flush I do not recommend using any machine that flushes under power.
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