Squaring the Rear Axle:

There are many different ways to square the rear end depending upon mechanical preference and comfort.
This is one popular technique utilized by many professional teams.
Place the rear end in the chassis and bolt up the torque tube. Set the axles on 6” blocks. Secure the bird cages with spacers and the wheel nuts.
Measure the distance from the rear round machined portion of the torque tube to the outer edge of the chassis by placing a straight edge vertically against the frame.
Centre the rear end by equalizing this distance on both sides of the car. This distance should measure between 10 1/8” and 10 ¼”.
Now with the rear centered side to side, start with the right side and measure from the leading edge of the rear axle to the front edge of the motor plate.
On a 39” car this measurement is 37 5/8”, 38 5/8” on a 40” car. Roll the axle forward or back on the blocks to achieve the correct distance.
Once you have secured that distance on the right side, check the left side. Ensuring that the rear is still centered in the frame and the right side measures correct, the left side may vary by as much as 1/8”. This is generally left to lie as is.
With the radius rods connected, place a level on the flat bottom portion of each bird cage and adjust the rods so that each cage is level with the bottom frame rail.
Now bring your rear arms up to each bird cage flag and adjust each rod end so that the lower bird cage bolts slide freely through the cage and the rod end.
Having completed this, recheck all of your measurements to ensure that nothing was moved during the previous processes.
If all measures correct, bring your Jacobs Ladder to the rod end or clevis and adjust the rod end of clevis in or out so that the bolt also slides freely.
With these operations complete, check your work by ensuring the torque ball is free and the Jacobs Ladder is not bound.
Now you are ready for race height set-up blocks and stops