64-70 Corvette Transmission Slip YokeCorvette 1964-70 Transmission Muncie Slip Yoke New Exact Replica of Original. This is the 26- spline for the 1964-70 Muncie Trans. Exact replacement to THE GM CHEVROLET unit that was discontinued. All corvettes with the Course input Muncie 1964-70 use this Slip Yoke. 26 counts the splines ; not the index gap , that would make it 27 - it's the same thing.