T10 input shaft for GM T10 transmissions. 10 spline.
Your choice:
27 tooth count Part #T10-16 (close ratio)
25 tooth count Part #T10-A-16 (wide ratio)
YOU CAN USE THESE INPUTS IN PLACE OF THE ONES WITH TREADED NUT-TYPE (1962/63, SOME MODELS). USE ORIGINAL NUT-TYPE RETAINER; RUN FLUID LEVEL 1/2' BELOW FILL BOTTOM OF FILL PLUG HOLE.