labor cost for installing a TRD LSD

I have a 2001 S-Runner and have receive several different quotes on installing the diff. anywhere from $300 to $900.

Anybody know how many hours toyota says it is to install it?

I would've gone with the $300 but I lost the sheet that had his name on it and noone seems to think I was told that.

Anybody? We don't have any Toyota mechanics or salesman out there?