Folks, it's definitely worth checking all the installs and learning how this all works.

Just measuring my pinion (+ caster) angles and i've worked out that the installer used the wrong height holes (control arm drop brackets) and i've been running stupid caster (too much) and a really bad pinion angle ever since I got my original lift.

I'm sure this didn't help with the increased wear on the driveshaft and then the diff (which I just had overhauled).