Pinion angle for a 4/7 drop regular

[Yogiarana]

Hey guys a I drive a 2014 Silverado regular cab and recently installed belltech's rear flip kit and djm control arms. I'm getting some vibration around 65mph and have done some research and figured it was my pinion angle. My question is do you guys know what the correct angle should be and how many degrees the driveshaft and how many degrees the yoke should be? Also in my kit they included a shim that I believed should have been installed with the thicker side to the front but read some where that when lowering a truck the thicker side should be towards the rear. Does anyone know which way it goes?

 

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