Over 70 mph vibration during acceleration only, caused by tapered rear lift blocks. The fix was to use straight cut blocks. Below is information on the kit I used as well as other tools and related videos. Tuff Country 79062 Block

Engine Performance Diagnostics

Special thanks to:

YouTube channel FriscoBoater
Here is his video where I got the idea of the straight cut rear blocks
- One year Review of the Zone 6" lift and a eureka moment!

- ScannerDanner Premium video using the Picoscpe NVH
Using the Picoscope NVH kit to find a drive-line vibration

Related videos:

Silverado 2500 lift kit install - torsion bar keys (part 1):

Silverado 2500 lift kit install - control arms, shocks, axles, front diff (part 2):

Silverado 2500 lift kit install - front diff lowering kit and install (part 3):

Silverado 2500 lift kit install part 4 - install control arms, axles, shocks, torsion keys:

Silverado 2500 lift kit install - rear block install, final pics (part 5):

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2009 Chevy Silverado 2500 3" lift kit install

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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