Charlie's info was about axle position, will look for his roll info.
Until then here is a bit about Ackerman and ball stud placement. These are answers to ? on
http://www.rc10b4.com/forum/index.php? so they read a bit odd. :-)
Changing the steering link hole position in the steering rack (From front to back), with out changing the spindles to the inline version, will change the amount of Ackerman the front tires have when turned. Ackerman is the front tire angle difference when the tires are fully turned to the right or left. For example, if your car has no Ackerman, when the steering is fully turned both front tires will be at the same 45 degree angle. If you add Ackerman, the inside tire (the one closest to the apex of the turn) will be at an increased angle compared to the opposite front tire. For example, if you turn the front wheels fully to the right, the right tire will be at a 45 degree angle and the left tire will be at a 30 degree angle. This difference in front tire angle is called Ackerman.
Increasing Ackerman will tame the steering down and give you better high speed sweeper steering. Decreasing Ackerman will make the steering more aggressive high speed steering and give you better low speed 180 degree corner steering. So using the "Back" steering rack position will make your car a little easier to drive because it will tame down the steering, but it may also tame it down too much and make you too slow in the corners.