Speedtech 68-74 Nova Torque Arm - Manual (Page 11)

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The supplied billet aluminum pinion clamp must be made to fit the pinion snout.
Due to the different variations in housings and castings you will need to grind
some of the support castings away until the mount fits perfectly. The diagrams
supplied with the axle brackets will show where and how much to grind off. When
you have the correct fit for the mount, bolt it together using the hardware
supplied with the mount.