Quote:
Originally posted by Duke2.6
P.S. Diffs have a vent at the top with a lose fit cap to keep oil from being thrown out, and these typically weep, which will coat the diff with oil over tens of thousands of mile. An overfilled diff will also tend to weep more as will sustained high speed driving. If it were me I would spray down the diff with mineral spirits to clean off the oil residue, then keep an eye on it. It could be that it is weeping out the vent then migrating down to the low spot and finally forming a drip, but you could also have a pinion seal or side seal leak.
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This is an excellent suggestion! I had noticed oil on my tranny and differential when I purchased the car. I decided to have the undercarriage steam cleaned to help source the leak. Well it turns out the leak had been coming from my engine (oil cap, power steering hoses and breather hoses!!!) and had managed to migrate down the backside of the engine and onto the tranny and differential. After fixing the two items my engine and undercarriage have been spotless. You may never know where the leak is coming from unless you spent the time cleaning first.
