if its a gt series turbo it was ball bearing , but u can not re-build a ball bearing turbo , so what charlie at evergreen does is machine the housings for journal bearings , i have used evergreen many times and the man is a genius , and he personally is against ball bearing turbo's , i would rather have one of his journal bearings than the most expensive ball bearing turbo's , thats just my .02 cents , bump for a nice turbo