My 1990 Sierra 4x4 is causing me a bit of a headache, its like it over locking but on both sides. Its rumoured that the xr4x4 and the P100 had racks that locked further than the the 4x4 cosoworth. Can ya see where the alloy is hitting the tie rod and the other alloys it hitting the anti-roll bar. Seems like it's not coming to its own mechanical stop but only when it hits the wheel. I've standard 15'' lattice alloys on it by the way

Any suggestions??