[Tom Kirkham]

In vehicles that use the half shaft as an upper control arm (Jaguars, and Corvettes), U-joints are your only choice. Note: the half shafts in this application are a fixed length.

In an original Cobra the with sliding half shafts, the conversions to CVs frees up the suspension. The problem with the sliding half shaft is they bind up under power. On a race track this is most noticeable on corner exit.