I have a 90 K5 blazer and I put 2 1/2 in springs in the front and 4in blocks in the back to level out the sagging old springs.

I have a vibration from about 10 mph to 25mph and then a vibe that gets progressively worse from 50 and above that turns to a growl when you let off the gas (when the driveline goes from drive to drag)

I've adjusted the pinion angle to approx 4 degrees on the rear shaft and had the front and rear drive shafts balanced and changed the universal joints on the front and rear drive shafts and still no change.

Any thoughts on how to fix the problem?

 

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