Trans fluid is not that different than motor oil it was designed to take out material left over from use --- our dura max chevy has an allison and every other motor oil change we do a trans plug pull 7 quarts of oil -- and the truck always feel like it shifts back to when we got it --- we use SYN in the race cars trans and 100 passes we change that oil -- pan drop -- if it has a smell to it or the color on a clean paper towell is a redish brown in color --- the pan gasket filter kit is 20 / 30 bucks and 1/2 doz quarts of oil and an hour of your time -- jz
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