Originally Posted by teknorc

Longer and/or higher link is more stable into a corner. If the rear end is coming around too quickly off throttle or in a sweeper, for example, or there is too much turn-in, go to a longer link. If that doesn't help enough, raise the link on the tower (lower the roll center). The flip side to a higher link is less on-power traction (more steering out of a corner).

A shorter/lower link will make the rear end very reactive and want to come around off power. You will gain traction/forward bite coming out of corners.

If you are a point and shoot driver who goes in hot, hits the brakes, turns and stabs the throttle, you will probably like a shorter link and/or a higher roll center (lower link). Some of this is track dependent.

To be able to drive a short and low link rear end, you have to be on the throttle all the way around the track. Even if it's really light throttle, that will keep the rear end planted pretty well. But if you let off to break or turn, that rear end will be hard to control.

If you are easy on the throttle and brakes and round the corners and drive out of them, try the longer link first. Only move the link up if you are still having issues with the rear end breaking loose off power.