Shifter detent function

[Spoof]

I've acquired a rebuilt tilt column and I just installed the shifter arm. I tried running it though the gears on my work bench, imagining it linked to a transmission.
I functions correctly in that you have to pull the spring loaded arm towards you to allow a shift out of park but then it just glides through the rest of the movement.
I haven't shifted a GMC in 7 years, does the only indexing on the column shift from park to reverse?

Thanks guys.