Pablo, the whine was from the front transfer case. It wasn't loud before, but, if I let off the throttle while cruising, it would disappear, and as I got back on cruising throttle, it would come back. Just a quiet background noise, most people wouldn't even hear it. Anyway, the only thing I did was change the front transfer case to AmSoil SVG 75-90, so, that's why I assume it is the source of the noise. The rear differential in Subarus are notorious for a little whine of their own...it's still there...but, no AmSoil SVG will be going in it for another 30,000 miles, since I have new SF HDS-5 in there. (Although, 30,000 miles may only take me about 6-8 months!) I'll be curious if the SVG takes out the rear differential whine, too. Don't know that it even means anything...but, it is interesting that is disappeared!