Spohn 399 - Manual (Page 2)

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9. Once pinion angle has been set, tighten all jam nuts and rear bracket bolts.
Note: Before adjusting your pinion angle, you must first loosen the two bolts that secure
the two rear solid rod ends to the rear-housing mount. This allows the torque arm the ability
to swivel up or down as you adjust the pinion angle. If you do not loosen these two bolts
the assembly will bind and you will not be able to adjust the pinion angle. After setting the
desired pinion angle, retighten these two bolts.
Ford 9” Rears: For those running a Ford 9” rear - You will notice that the rear mounting
bracket of the torque arm has two sets of mounting holes. On the 9” rear you want to use
the set of mounting holes that are towards the driver’s side of the car. On a stock rear or
12-bolt rear, you would use the set of mounting holes towards the passenger’s side of the
car. The reason for this is that on a 9” rear, due to the larger center section, the torque arm
mount on the rear is actually 1” further to the driver’s side of the car compared to the OEM
rear. Using the set of holes towards the driver’s side of the car in our rear mounting bracket
will move the torque arm back to the OEM location and line it straight up with the front
mount. If your 9” rear is equipped with a nodular (large ribbed) center section, it may be
necessary to grind away part of the rib so it does not interfere with the torque arm’s rear
mounting bracket.