Re: Spring perches not level?
You will have to finish the suspension and drive the truck on the road at various speeds to see if you have a driveline vibration. There is no way (that I am aware of) of predicting that you have it right until you actually drive the truck.
When these "running vibrations" show up, it is usually traced to the angles at each end of the rear drive shaft not matching. These angles are measured with the truck on the ground and with the 'load' in the truck that you will normally be carrying. I had mine checked with a full tank of gas and me sitting in the truck. Spare tires, tool boxes, ex-wives, favorite dog, etc., etc. ...., can make a difference in how the truck compresses the suspension, which in turn will change the driveshaft angles.
Good luck with it. If you know a really good truck shop that balances driveshafts on a regular basis, they will be able to help you easily if you have a driveshaft vibration. They understand pinion angles too.
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