2009 Chevrolet Suburban vibration

Andrew53
Mon, 18 Jun 2018 18:37:55 +0000
Maintenance/Repairs

I have a 4x4 Z71 2009 Chevy Suburban with 178,000mi. It has a vibration that is very slightly felt at 55-60, and by 78 the car is shaking like a high school kid on prom night, and then 90-95 it dissipates (what ever causes the vibration is going too fast at that point). The vibration is not RPM dependent, but speed dependent. While car idles, the motor hesitates occasionally. New MOOG suspension and front hubs (everything new, dropped all parts and installed new at one time to avoid doing the same work over and over), U-joints on the main shaft, all fluids changed / inspected, new carrier bearings on the rear axle, new motor mounts and transmission mount, P0304 cylinder “misfire in cylinder 4” code, oil consumption issue (Moroso air/oil filter installed in PCV system to prevent oil into the intake manifold), new wheels (2018 stock), new tires (BFG). Here’s the fun part, the vehicle is a work vehicle, and carries 3-450 lbs of medical equipment in the cargo area. When unloaded it seems the vibration is less. Besides purchasing a new rear axle, t-case and front differential, what can I do?

6 posts - 6 participants