Quote:
Originally Posted by Evil Eye
The external tranny filter should be changed every 15k miles, while the fluid should be changed at 60k miles. Mercon-V is the fluid, available from Ford; I wouldn't use substitutes as this is a synthetic fluid. It takes 15 quarts of fluid which should be plenty; if you need additional cooling, add another tranny cooler not a deeper pan. I've changed my fluids and filters myself and it's easily done by a do it yourselfer... Post up if you are having problems.
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What tranny are we working on here, a Torqshift (6.0L) or a 4R100 (7.3L)? Since you mention the external transmission filter, I'm assuming you are referring to a Torqshift. These transmissions DO NOT take Mercon V. They take Mercon SP. Also, bear in mind that there is a cooler bypass valve that comes into operation during cold engine startups as controlled by the TCM to bring TFT (transmission fluid temperature) up to operating temperature which also disables torque converter clutch operation. With the torque converter clutch disengaged due to TFT being too low, that also increases fuel consumption.