Sounds like that turbo's junk now. A used stock turbo will cost as much as a new turbine shaft. I would go that route until you can swing the upgrades. But if you want to rebuild it....
http://cgi.ebay.com/ebaymotors/CT-26...item5d2f05d4fd
The shaft...lol.
http://cgi.ebay.com/ebaymotors/Turbo...item3f0c559e6a