[Morris]

Steve

It's the 1 1/8" 26 input spline..... Ford.....

Tremec finally started making them so we could run the TKO 600 with the Lakewood bellhousing as used for the Top Loader....

Another foot note is that the output shaft is a 31 spline and you can get the 1350 Spicer U-joints for the driveshaft...

Jeg's or Summit is where you would get the Yoke...

Morris