Once again, a smoke machine will find the exact source of the leak in 15-30 seconds 100% of the time. Although it's possible the pinion seal is the problem, it's unlikely so many seals have been incorrectly installed by professional builders. Not impossible, but not likely. IMO, a definitive test ends all speculation. If it is a seal again, then you know exactly what you have to deal with. At that point, I would buy the best seal available, make absolutely sure the garter spring stays in place when installing by using grease to pack it in place and use a light film of RTV on the OD of the seal. I am leaning toward a cracked housing or an issue between the the axle tubes and the housing. Pinion seals rarely leak huge volumes of lube without any visible damage, unless it's the wrong seal multiple times. Good luck with it and please report back so we can all learn something.
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