A center axle disconnect system or CAD is an alternative to locking hubs. CAD systems are typically used in front drive axles on four wheel drive vehicles. A CAD system works by having an axle shaft (typically the longer shaft) split into two pieces. One piece is connected to the carrier, the other connected to the wheel. This reduces drag on the axle by allowing only the spider and side gears to spin, while the differential carrier, pinion and drive shaft are at rest (as is the inner portion of the disconnected long shaft and its associated side gear). The axle is engaged by connecting the two split axle shafts. The ends of the axles are typically splined and use a collar to connect the two shafts together by sliding over both shafts.
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