I would start here:
http://www.subaru-svx.net/forum/showthread.php?t=32758
If that doesn't help, send a PM to
TomsSVX. Or try PMing
svxhunter, he's in your state and might be able to physically help you.
I just thought of something else . . . With the 1.1:1 reduction in the rear of the WRX tranny, you don't have to change the stock SVX rear diff gearing. If you reconvert your SVX rear diff back to it's original 3.545 gearing you'll be ready to roll!
Good Luck,
Dan