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2001 Suburban 5.3L, 297k miles
1,657 Posts
If it's a vibration shaking the cab and seat head rests but not the steering wheel, I will start checking drive shafts, front and rear, for bad u-joints. If you have a two-piece rear driveshaft, you need to check the center bearing support.
Also check the transmission/transfer case cross member support bolts. They can be loose.
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