A CVD is a constant velocity joint driveshaft, ie the hub and shaft are one unit. It moves through a smoother operating range than an old fashioned universal joint. The kit Durga comes with dog bones which are separate from the hub and look like er, a dogs bone hence the name.
CVDs on the front should give smoother steering and the big benefit with them is that if you rip a corner off you won't loose the driveshaft out on the track - dog bones can be swines to find in the grass/dirt.
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