I have been trying to install the driveshaft and wanting to know what the trick is. I have the new TKX transmission and IRS. I noticed a notch on the spline end of the drive shaft but can’t seem to locate a notched spline on the transmission spline - am I missing something?

I have had the driveshaft neck inside the rubber boot (no easy task itself) and rotated the drive shaft all the way around as straight as possible but I can’t get the spines to marry.

I must be missing something.

Thanks in advance!