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2007 Chevy Silverado Z71 Lower Differential

6. All replacement knuckle designs increase track width somewhat, plus the diff is lowered 1 inch less than the lower control arms in order to achieve an ideal driveshaft angle. These two factors increase the distance between the differential centersection and the wheel hubs, making the CV axleshafts a tad short. Billet-aluminum CV axle spacers restore the proper axle length.
2007 GM Half Ton Pickup and SUV Lift System

 6. All replacement knuckle designs increase track width somewhat, plus the diff is lowered 1 inch less than the lower control arms in order to achieve an ideal driveshaft angle. These two factors increase the distance between the differential centersection and the wheel hubs, making the CV axleshafts a tad short. Billet-aluminum CV axle spacers restore the proper axle length.  View Related Article

 

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