Running really light oil in a geared diff seems wrong. Anything lighter than 5000 is so easy to diff out on an on-power sweeper, the diff action is WAYYY too light and the car will always want to rotate on power.
What Chris is saying about the geared diff wanting to rotate on power is right. Although... if you thicken the oil even more that should straighten it up on power. For example, the oil supplied with the Schumacher KF is 12,000! 5,000 is the very lightest I'd want to put in the DEX210, I would personally be looking at 7000 and upwards!
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