Is it 31, or 30 spline?
If its 30 spline, I counted 30 on the end of the shaft.
Also, check out TCI, they list 27, and 30 spline for the torque converters....
http://www.tciauto.com/Products/GM/gm_4L60E.asp
EDIT: I`m going to assume that 31 spline was a typo, kenny, as Scott also says it a 30 spline, and everywhere lists 30 spline converters.
So that means it IS 30 spline. PHEW!
Thanks for helping me sort that out guys!