P.S. vs. manual steering coupler and steering column differences

[66FBCharger]

What are the differences between a P.S. coupler and a manual steering coupler? Length? Spline?
Is there a difference between steering columns? What is the difference? Length of the inner shaft?
Are steering couplers still available new?

[TommyGun]

The length is the difference.  Coupler is the same.  My 68 has power steering and came with a column shift column but the guy also threw in a manual column (no shifter on the column.) When I went to switch out the columns I found they were different length, must have been from a manual steering car I think.   So I ended up disassembling both columns to swap the shaft over.

[Charger-Bodie]

Coupler is larger inside diameter on manual.

[TommyGun]

Interesting, I guess I don't know for sure what my parts came from but I was able to make it work!

[Kern Dog]

That is right. The splined shaft on the steering chuck is larger on manual steering cars.
I had a steering column coupler from a manual steering car in my parts stash. I installed it in a power steering column and into a Duster. I had the car up on jackstands  doing front end work and pushed the tires side to side. Doing so, I heard a grinding noise. It turned out to be the coupler and shaft ! Up to that point, I did not know that they were different sizes.