Wakeboard03S10
+1y
On the f-150 in my profile he had the same problem after doing the flip kit. He took it to a drive line shop and they ended up welding the leaf spring to the axle. It stopped the vibration and he hasnt had any problems since and that was 20,000 miles ago...I dont know if that was the proper way to fix it but it fixed it and it was cheap...so ask around see if its a good way or not.