410 suspension arms binding

[jaffacake]

Half way through my build of a 410,the front & rear arms are binding
I have checked the build twice & i have followed the build manual to the letter (or diagram) anyone else experienced this?..maybe they free up after some use?? or is it normal to take some very fine emery cloth to the arms where they sit against the anodised wheelbase shims??
Also one of the sun gears in the diff housing is stuck on the outdrive,contacted Durango,was told this 'can happen',was told to soak in wd40 & it should pop off,so its in soak as i type..bloody damn tight!!