Gears & Axles - Torsen or Auburn? Pics included

Hey so i cracked open my differential and I'm not sure if I have a Torsen or Auburn. I have a 98 TA and was told all 98s have Auburns but it looks like this is a Torsen...

http://inlinethumb27.webshots.com/44634/2003028850106648634S600x600Q85.jpg

http://inlinethumb39.webshots.com/47910/2965836000106648634S600x600Q85.jpg

Torsen, you can tell by the big block in the center.

can I use non-synthetic with Torsen?

Absolutely.

yub that torsen, auburn have yellow spring looking one. I would use redline 75w90 on it ^^. I wish my auburn allow using synthetic, if it does im putting redline 75w90 on it ASAP.