Just trying to work out two secondhand halfshafts.
Both are less than 22.5" - more like 22 1/4".
Of this measurement, approx 3/4" is the thread, so they are 21.5" to the end of the contact area.
They have different finishing to the toothed end... the clean one is 0.86" diameter (just behind the teeth), and there is more chamfer on the inner circle pictured. The tarnished one with less chamfer is 0.87". Tony's early and late measurements equate to 0.87 and 0.89 of an inch for the two shafts.
The 2 diameters of SWB shaft are apparently not interchangeable. Is this just because of the diff case bush alone?
I presume both mine are "earlies"? Is the changeover to the fatter shaft came in with the last incarnation of the swb axle type (type III in the green Companion picture, accepting type 4 is the D type)?