For improved artrickulation!

If you raise the suspension on a Land Rover, it puts a fair bit of stress on the chassis bushes that hold the rear (and front) radius arms. These are swinging arms which join the rear axle to the chassis allowing it to move up and down as well as articulate (twist).

Longer travel suspension should alow for greater articulation, but you tend to find that the stiffness of the chassis bushes limits the articulation before the other mechanical limits of the suspension are reached.

The most common solution to this is 'cranked raduis arms' where the end of the arm is bent slightly so that with the raised suspension and the coresponding steeper angle of the arms, the bush is not being stressed. This will give you another couple of inches movement before the bush reaches the limit of it's movement.

My original solution to this used tractor 'Top Links' which consist of a bar with a rose joint on either end. I made an adaptor to attach one rose joint to the chassis and the other to the axle.

These worked very well, except there was nothing stopping dirt from getting into the joints and over the course of six months there was a few millimiters of slop in the joints and they rattled some!