VOLVO VNL - AIR RIDE HEIGHT( Vibration)

Hello good people. I was reading the whole thread about this ride height. My Volvo vnl 670, 2011 its vibrating for some reason i checked everything from driveshaft, u joints, yokes. New front springs, 10 new tires drives kelly’s and steer yokohama. New fuel pump on it. There is nothing that i can notice is loose. Like some of you guys said i went today on the lot to measure it and rear airbags from the welding to bottom of the frame 8 3/4 almost 9 and front airbags from welding to bottom was 8 1/2. What do you guys think maybe my ride is too high and cause this vibration coming under my truck and noise. Its noticeble in 6th gear and up it freaks me out everytime. I feel something will break anytime. I will also send a pic to show if my measurment is right. Thank you any andwer or opinion is welcome. Have a blessed day.

 

It was replaced 5-6 months ago. I checked the arm and its not moving it is tight. I forgot to mention 2 weeks ago my wheel seal start leaking and when the mechaninc open the wheel the nut that holds the bearing the bit one on the axle was loose he replaced the seal and tight and kinda vibration went away and now back again. I hope the nut didnt loose again.