Symptoms of bad pinion angle?
I have been trying to track down a vibration problem. When the pinion angle is off what symptoms do you generally, have. I know you can measure the angle. I am currently having a problem where I get a small vibration and a loud lower tone hum when I drive around 70mph. When I drive faster it appears as though the hum gets louder but does not change much in frequency. It almost seems like the sound is coming from the transfer case area but I am still trying to track it down. The hum goes away when I take my foot off the gas. I have a 1999 XJ with a 3.5” RE AAL lift kit, and SYE. The problem started occurring when I first put the lift on. I have tried both 4 degree and 6 degree shims. With the 4 degree shims the hum appeared to occur at a lower speed (around 60mph). I am just trying to figure out if when the pinion angle is off if you get a hum like this? Any ideas guys?