Sonnax chromoly turbine hub GM-HTCM-49HS with hardened internal spline replaces previously offered GM-HT-49HS.
GM 6L90 (captive clutch) converters are known to have two versions of turbine hub. Check the end of the hub towards the stator to determine if you need the GM-HTCM-49HS with the chamfered nose or GM-HTCM-56HS with the stepped, chamfered nose.