Powerstroke 7.3L GTP38 Turbo Compressor Wheel + Upgrade Rebuild Kit-Stepped Gap Piston Ring 360&deg; Thrust Bearing Direct Bolt on Compressor Wheel, no mods needed for GTP38 and TP38 Turbo. Upgrade Stepped Gap Pistion Ring on Compressor side to eliminate Oil Leak problem. 360 Thrust bearing system for High Boost Applications. Suitable for 1994-2003 Ford Powerstroke 7.3L GTP38 or TP38 Turbo.