Join Date: Oct 2000
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Re: Black oil in the rear diff, what does that mean?
First, what kind of spool did you put in and have go bad in 400 miles? No insult intended, but the oil condition initially sounds like it was over due for a change. Many Samurai's are bought with 100K miles on the lube and never a thought about it until a leak shows up. In the axle housings that I have pulled apart that I know have high miles on the lube, I always find this black film inside that has to be cleaned off to get rid of it. It sounds like what CC said, and the new lube is doing the cleaning for you. It will take some time, so would't worry about it. As far as the spool failure affecting the lube, it would depend on what type of failure and if it could have caused high friction to heat up the lube to the point of burning it.
TGT - NCO