How to determine and adjust centerline thrust?

67Dart273 said
I've never heard the term. I googled it, and only got hits re: aircraft.

If you are talking about general frame alignment, there are measurements somewhere in the shop manuals in the body section. Just like modern cars with IRS, you can check front/ rear alignment.

Hey Del, thanks for answering.
Centerline thrust in cars is how the rear axle of the car is lined up with the rest of the car as it goes down the road.
They (auto accessory) places and alignment places sell and use plates between the front spring hanger and body to adjust it.

What I was wondering is what measurements and measuring points they use to determin it.

I googled it also and found this article about it that says,

"The thrust line denotes the actual direction of the rear wheels (a right-pointing thrust line or a left-pointing thrust line). This is the real-world direction in which the rear wheels are aimed, irrelevant of the geometric centerline. You can also view the thrust line as a line that divides the left and right rear wheel toe.
Thrust angle is the angle formed by comparing the chassis geometric centerline to the rear wheel thrust line. This angle is measured in degrees. A right-aimed thrust angle that deviates from the centerline is referred to as positive, while a left-aimed thrust angle is negative. "

Here's the article, but it doesn't say how to determin it.
http://www.motor.com/article.asp?article_ID=1094