YES! You could see the goddamned helical gears. Jesus, I'm not that much of a moron.
Plus, you can feel the car kick power to the outside wheel when it starts to spin the inside wheel.
It doesn't look at all like the obx diff either.
Obx:
My s15:
Someone else's s15:
It is
most definitely a helical, and an s15 one at that. I picked it up from ebay-- here's the auction:
http://cgi.ebay.com/ebaymotors/ws/eB...5195837&rd=1,1
Alex
edit-- You're right, I do hear the faintest of whines, but only at 50 or 60+.
Oh, and here's another pic where you can actually see the gears:
