BMR Suspension XTA001 - Manual

BMR TRAK PAK AND EXTREME DUTY TORQUE ARM INSTALLATION
Part #’s TPU001 and XTA001
1. Raise car and support with jack stands under frame allowing rear suspension to fall to its furthest position. If using a drive on service lift, the install may be
performed with the suspension loaded
2. Remove both large bolts that attach the factory torque arm to the rear end. Remove all 3 bolts that hold the torque arm front mount to the transmission and
remove the entire torque-arm and front mount assembly. Automatic cars require lowering the transmission cross member in order to remove the bracket.
3. Position the BMR torque arm over the rear axle, slide new bolts through and tighten.
IMPORTANT NOTICE TO MOSER 12 BOLT USERS: This product is only warrantable on rear axles that utilize the factory style “through bolts” to connect the
torque arm to the rear end. Moser 12 bolt rear ends utilize a threaded bolt hole that has been proven to have bolt retention issues when used with aftermarket
torque arms. If you have this particular rear axle, understand this warranty disclaimer and still wish to use this product, keep in mind that lock washers, or Loctite
brand thread sealants are not substitutes for periodic bolt inspection.
4. Using the provided pivot plates and hardware, attach the universal crossbrace to the front torque arm mount as illustrated
in Image 1. The crossbrace should be resting against the bottom of the subframe connectors. This crossbrace fits various
applications and requires custom fitment per application. Determine the weld points on your subframe connectors and
mark the crossbrace for cutting. For maximum ground clearance, the crossbrace should be installed as high as possible
without contacting the floor pan. Depending on subframe connector design, the included vertical weld points can be
welded to the bottom or the side of the subframe connector. Using the control arm mounting bolts as a reference point,
measure each side to ensure that the crossbrace will be square.
5. Once the crossbrace has been fit and the weld points marked, prep and weld the vertical plates into place. Weld cross
brace to vertical plates (See image 2 below).
6. Reattach the pivot plates, attaching the crossbrace to the
torque arm and tighten the bolts.
7. Set the pinion angle using the following method:

Load the rear axle by either setting the car on the ground
or letting the car rest on jack stands positioned under the
rear axle.

Place the angle finder on the driveshaft and record the
angle. The driveshaft angle is negative if it slopes
downward towards the rear of the car. The driveshaft
angle is positive if it slopes upward towards the rear of the
car.

Now place the angle finder on the rear end torque arm mounting plate and record the
angle. The rear end angle is negative if it slopes downward towards the front of the car.
The rear end angle is positive if it slopes upward towards the front of the car.

Add the two measurements. This is your pinion angle. (Example: -2 rear end angle plus -1 driveshaft angle = -3 degrees)

Turn adjuster to achieve the desired angle.

As a starting point, most F-Bodies seem to like the following initial settings: Automatics: 1-2 degrees negative Manuals: 2-3 degrees negative

Please refer to www.bmrfabrication.com to view the video for setting the pinion angle.
8. Once pinion angle has been set, tighten all jam nuts. Verify that torque arm mounting bolts are tight and tighten the rear cross bolts attaching the rod-ends to
the torque arm mounting bracket.
OPTIONAL WELD-IN DRIVESHAFT LOOP INSTALLATION: Remove one end of the driveshaft and slide
the driveshaft loop over it. Reinstall driveshaft. Position the loop 6 inches from the front u-joint. Mock it up so
that there is sufficient clearance to allow the driveshaft to go up and down 1.5”. Using the provided length of
tubing, cut and weld the ends to allow mounting the loop to the crossbrace. Double check the clearances and
weld into place.
WWW.BMRFABRICATION.COM
This product is an aftermarket accessory and not designed by the vehicles manufacturer for use on this vehicle. As such,
Buyer assumes all risk of any damage caused to vehicle/person during installation or use of this product.