My experience with the Durango and geared diffs was that you run lighter oil in wet conditions and heavier in dry.
Not sure on the weight because you have to be careful that more weight near the rear axle could cause the rear of the car to swing more, pendulum effect.
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MAD MODELS
BRITISH NATIONAL 4WD VETERAN CHAMPION 2012
BRITISH NATIONAL SERIES 4WD VETERAN CHAMPION 2013
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