I was disappointed by these driveshafts. Although they appear durable they strike me as somewhat rough and ready.
The sliding fit was poor, having a rough feeling action even after greasing. (I will have to take them apart for polishing). Furthermore neither of the pairs of shafts ran true producing disappointing vibration.
Finally I had to try the inner and outer shafts in many positions relative to one another to avoid horrendous axle vibration.
I had my dingo set up with slightly shorter than standard wheelbase to achieve longer suspension travel with longer shocks and the shafts were too long with this set up.
I have succeeded in fitting the steel shafts but it took me a whole, frustrating, afternoon!