The most common problem is caused by placing the vehicle's weight on these assemblies before the axle nut is tightened. People will do that to keep the axle from turning while they tighten the nut. Once weight is placed on it without the nut being torqued, she's junk.
Be sure to follow the torque specs that come in the instruction sheet too. It is typical on GMs to find that value as high as 240 foot pounds.
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Sunday, November 28th, 2010 AT 5:17 AM