double cardan joints are longer therefore shortening your shaft and increasing the angle the driveshaft runs at, your diff pinion will be pointing at the same angle as your shaft anyway so it will serve no benefit
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here is one with two double cardan joints
https://www.aulro.com/afvb/images/im...011/02/949.jpg
as per the tom woods site
whats everyone done for brake lines? blanked one of the rover ones and used the other?