Proper Race Car Alignment - Alignment Tech Photo Gallery
In the past it was common to string a car by making marks on the floor. This is a good method for checking rearend square and can be used to line up the right-side tires. It's a little slower to do than the raised string method but can be more accurate due to the process of dropping points down to the floor with a plumb bob and then making direct measurements to the rearend. The numbers relate to the sequence of making the lines.