I don't have a factory repair manual, but just as good it's for a van turbo but the principle is the same.

Welcome to BDrummonds Van Turbo Rebuild Web Page

Here's where to get your rebuild kit, and any other parts you may need.

Riffraff Diesel: Garrett GTP38 Journal Bearing Rebuild Kit

Here's some turbo information.

73LTurbochargerGuide.pdf