Hey Paul. Do the type 3 cv axles use a standard type 1 stub axle?
Type 1 and 3 axles are the same diameter/spline so it's the cv joint outer diameter, Seth, that dictates which stub axle (and flange on the trans side) is used, so yes, type 3 axles are used with type 1 parts. Bus cv joints are slightly larger diameter (100 mm vs 90) than type 1 and so require type 2 or type 181 (thing) stub axles and flanges. IIrc bus and thing cv's are the same diameter but are slightly different thickness (I'm guessing the type 4/181 is thicker and uses slightly bigger ball bearings to achieved more angle)? 930 cv's are larger again, at 108 mm.
The bigger cv joints are used off road, as they can take more angle, but the type 1 cv's have proven themselves in all but the most powerful street cars. There are type 1 cv's (and axles) in 11 second cars and they hold up, so it is not worth doing in our cars.
Type 1 cv's maximum angularity is 12° Type 2 (bus)- 17° Type 4/181- 22° 930- 25°