Poor quality ATF breaks down a lot quicker too. It forms an actual friction bearing surface inside the gearbox and torque converter. I always use Comma MV ATF or good quality Dexron III fluid in my Aisin-Warner boxes.
EDIT:
How healthy is your transmission oil cooler (I think its the bottom part of the main radiator on the surf). If it has poor efficiency, the ATF will be getting too hot and breaking down as a result.
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Last edited by Surfer Ross; 4th September 2010 at 19:09..
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