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Im running factory 1/2 ton 56" springs, zero rates and flip kit in the rear and 1/2 ton 52s up front with zero rates. Next step is getting the drive lines done what is a good drive line/yoke angle and do I need to run a cv style in the rear.
If you're running a CV shaft, you'll need a pinion angle that points the pinion at the transfer case, and the driveshaft should be at the same angle as the pinion. The correction needed will vary depending on the truck and the amount of lift, so get a cheap magnetic angle gauge and start taking some measurements.
This can be a tricky question to answer so I'll just tell you what I did to my K5.
I have a K5 with a doubler (lifted 7" and the rear axle moved back 3") and had to use a CV type shaft as I was unable to shim the vibration out of it while using a standard single joint shaft. Once the CV shaft was installed I turned the pinion to 2 degrees below the riding slope of the driveshaft (by cut & turning the spring perches). It runs smooth and quiet now.