Level car.

Sit car on turntable.

Take camber measurements at 20* right and 20* left.

Calculate caster w/ googled equation.

Caster (deg) = (180 / 3.1415) * [(camber1 - camber2) / (turnangle1 - turnangle2)]



Shortcut for Caster w/ 20* turns:

Caster = 1.432 x (camber1 - camber2)

 

I took road trip to test DIY alighnment.
67 mustang w/ manual unisteer rack.

DIY settings:
Camber = -0.7, -0.7
Caster = +4.2, +4.36
Toe = +0.11 toe in

Goal: 70mph stability

Test 1: grooved bridge I-75 MM 72 Loudon.
Car used to tram line over this bridge but did fine this trip.

Test 2: Straight line tracking at 70mph.
Car used to wonder but now firmly tracks straight ahead.
Had this car for decades; it has never tracked this well.

Result: The high speed stability and return to center is perfect w/ above DIY settings. Low speed steering effort is a bit hard but ok for me.

I would not run more than 4 caster w/ manual rack. Lower caster reduces low speed steering effort at expense of straight line tracking.

 

I did my own alignment also but "only" went to +3.0 caster on both sides. Car tracks and handles great at speed. At very low speed you will get Popeye arms trying to turn manual steering.
Write up and info here: http://chris66dad.tripod.com/id27.html

 

I installed 1/16" shim on front UCA bolt (driver and passenger side) to give me a head start at increasing caster while minimizing LCA stress.

 

i tried to look at your attachments, it says i dont have permesion ? how do i get it.
i do have a account for this site thanks