Link to 4link calculator
http://mysite.verizon.net/triaged/fi...arLinkV3.0.zip
Here is a good explaination of anti-squat and diagrams
"When a vehicle accelerates, the weight shifts rearward. The higher the weight is above the ground, the greater the shift off the front and onto the rear. This extra weight will compress the rear suspension, make it SQUAT. But there is also a torque on the rear axle, equal and opposite of the tire torque. The pinion will try to rotate upward. The links resist this torque by putting forces into the frame. These forces may try to lift upward. The upward force will cancel some of the squat from the weight shift, ANTI-SQUAT. The easiest suspension to understand is a ladder bar/radius arm setup. if the axle trys to rotate backwards, the end of the arm will push upwards. The shorter the arm, the more upward force it will create. The greater the force, the more anti-squat it has. For understanding anti-squat, a 4 link can be visualized as a ladder bar, wherever the links would cross is the theoretical length of the arm. This picture is a ladder arm and 4 link with the same anti-squat geometry
For more antisquat, the 4 link should have more angle, making the intersection shorter, for less anti-squat the links should have less angle. The height of the intersection is also important, the higher it is the more antisquat it has. Another pic, the red setup has more than 100% anti-squat, the blue has less. The drawing has a horizontal line through the CG, and a vertical line through the front wheel. Then a line is drawn from the rear tire contact patch through the 4 link intersection, till it crosses the front axle. In the drawing the CG happens to be 38" the red suspension crosses the front axle at 48" 48/38 = 1.26. Thats 126% anti-squat."
It should also be noted that the COG measurment is of the unsprung weight
Another cool analysis to make things more complicated
Anti Squat, the final answer - Pirate4x4.Com Bulletin Board