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vibration after lowering

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Old Feb 25, 2007 | 10:12 AM
  #1  
79trailerspecial's Avatar
79trailerspecial
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vibration after lowering

I have a 2006 f-150 supercrew. I installed the fabtech 1-3 inch rear shacle kit and I went full lower at 3 inches. The truck now sits level but I have picked up a vibration from the driveline. I have read other post about growls and this is probably a slight vibration as well. Does anyone know the degree of pinion shim that should go in to correct this?? I am thinking a 2 or 3 degree shim should do it. Any input is appreciated.
 
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Old Feb 27, 2007 | 08:44 AM
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pjbonthebeach's Avatar
pjbonthebeach
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I purchased a lowering kit (1.5-2.0 inches difference) that includes tapered shims to keep the third member (differential) at the correct angle and prevent vibration. If you are lowering the rear 3 inches without the shims, that is likely the problem.
 
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