Speedtech 70-81 Camaro Torque Arm - Manual (Page 16)

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10. Place your housing/ Torque Arm on a jack and raise it up into position. Install
the front pivot pin into the front X member. Install the rear trailing arm ends into
the brackets on the axle housing using the 12 x
3 ½“ bolts and nuts. Do not
tighten completely. Install the shocks without the springs. Install the pan hard bar.
Set the axle housing to your approximate ride height location and check and
adjust the pinion angle by shimming between the billet mount and the torque
arm. Be sure to check drive shaft clearance while doing this.
Note: Pinion angle should be set to between 0-2 degrees from the crank shaft angle,
not level to the ground. (If you put a digital degree gauge or inclinometer vertically on
the face of the crank pulley and it reads 87 degrees then you should set the pinion at
between 87-90 degrees)
Adjust pan hard bar to center the axle. The best way to do this is to hang a plumb
bob from the peak of either side rear wheel opening and measure inward to
adjacent points on the rear axle. Adjust as necessary.
11. Re check that all components have clearance and that all measurements are
correct.
12. Remove shocks and assemble the springs onto the shocks .
13. Weld in the upper rear X member.
14. Reinstall the shocks.