BMR Suspension TA006 - Manual (Page 4)

TORQUE ARM INSTALLATION INSTRUCTIONS (Cont.)
15) Repeat step 18 for the other side.
16) Loosen the jack screw from the bottom side of the torque arm using a 3/8” Allen
wrench.(Image 6) Loosen it as far as
possible to provide clearance between the
rear end and the torque arm. This will be
adjusted in a later step.
17) Place large diameter washers over the
supplied ½” x 3.25” bolts and insert them
into the four holes on the torque arm. It is
typical for these holes not to align properly
and is necessary to use a pry-bar to pivot the
rear end until all four bolts slide through.
NOTE: this step is somewhat difficult and it
may seem that the parts do not fit together
however all assemblies are pre-fit and tested
before shipping to insure proper fitment.
18) Once all four bolts are through the assembly, place another large diameter washer and a
nut on each one and finger-tighten them.
19) Using a 1-1/8” socket, tighten the four ¾” bolts on the rear of the differential mounting
plate to 150 ft/lbs.
20) The following step involves setting the driveline angle. While this process is actually
very simple, it is difficult to explain so we have provided detailed instructions and
examples below. Driveline angle is the difference between the pinion angle and the
driveshaft angle. Zero degrees means there
is no angle and the pinion and driveshaft are
straight as viewed from the side. If the
angle is negative, the driveshaft and the
rear-end will form a “V”. If it is positive,
the driveshaft and rear-end will form an
“upside down ^”. For street driving this
angle should be between 0 and -3 degrees to
promote long u-joint life.
Begin by placing the supplied angle finder
on the rear BMR mounting plate as shown
in Image 7 and record the reading. Take
your reading from the drivers’ side of the
car. Since the rear cover is 90 degrees perpendicular to the pinion, this angle represents
the angle of the pinion gear minus 90 degrees. Now place the angle finder on the
driveshaft (Image 8) and record the reading from the drivers’ side of the car. This angle
represents the driveshaft angle. The goal angle to reach is a 2 degree difference between
the two recorded angles. For example, our test car used for these instructions had the
following readings.