Outer Limits 4x4 Board

Hey everyone. I've got a SWB with a 3" suspension lift (and 15mm packers in the back) and only 32" bighorns. I had drop boxes put in with the lift, and the car had vibrations so i put shorter rear upper arms from superior on (non adjustables due to being a poor uni student). A couple of months down the track and i've just put 16mm longer rear lower arms on because the car would slightly vibrate when the fuel tank was low and was told longer lowers would fix it. Now the car is vibrating like a crazy and is much worse!! could the diff have been pushed too far back or pinion angle rotated too much?

im no expert but i reckon because you put shorter top arms which turn the top of the diff a lil to the front and when you put longer lower arms you have now pulled back from the bottom of the diff.
So maybe you have over corrected the angle to stop the vibration.

Just a thought!

yeah thats what i thought. might have to buy some adjustable uppers and sell the fixed ones.