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1979-2004 Mustang BMR Adjustable Lower Control Arms - Review & Install
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Published on 2017-07-17
Mustang BMR Adjustable Lower Control Arms.
Reduce wheel hop to improve times at the track with BMR's 1979-2004 Mustang rear lower control arms! The factory lower control arms are prone to flexing under load, which causes wheel hop and bushing deflection. BMR designed their lower control arms to not only reduce wheel hop, but also allow you to adjust the arm to your preferred position. This means you can dial in your pinion angle and your preferred articulation point!
Their adjustable control arm kits are constructed with heavy duty MIG welded, 1-5/8" DOM steel tubing to greatly reduce control arm flex. BMR utilizes a chrome moly steel, CNC machined, center adjuster that provides the best strength and durability for long lasting performance. Spherical bushings take the place of your original rubber bushings on the body side to reduce bushing deflection under heavy loads. On the axle side, the rubber bushings are replaced by very strong 95 durometer poly-bushings. BMR tops off their Made in The USA upper control arms with a gloss red or hammertone powder coat finish for durability that lasts!
- Will NOT fit 1999-2004 Cobra.
Application: 1979-2004 Mustang
How’s it going everybody? Landan with Late Model Restoration. Today I’m going to be taking a look at BMR Suspension’s rear lower controls and why need a set for your 1979 to 2004 Mustang.
BMR is known for making top notch suspension components for several year ranges of the Mustang. Their keen eye for detail and dedication to perfection makes every BMR product a must have for Mustang owners.
BMR's rear lower control arms are currently available in a few different options. Those include a single adjustable version or an on-car adjustable version. Both varieties are offered in a glossy red or hammertone powder coated finish and are designed to fit solid axle equipped 1979 to 1998 or 99 to 04 Mustangs.
79 to 98 cars did have an M12 bolt from the factory, so that is why you see the separation in years when it comes to control arms. Be mindful of that when you about picking up a set for your car.
The single adjustable version will feature chrome-moly tubing for strength, spherical bushings on the body side, and polyurethane bushings on the axle side.
Now, the double adjustable option will feature one and five-eighths inch DOM or drawn over mandrel tubing, and like the single adjustable arms; these will have spherical bushings on the body side and polyurethane bushings on the axle side.
Each BMR rear lower control arm will benefit your Mustang in several key ways. Those benefits include firmer launches, improved handling, reduced wheel hop, and they’re even on car adjustable to help dial in pinion angle and the instant center of gravity.
To begin, support the car via a lift or jack stands.
Remove both rear wheels and support the rear end center section.
Before removing the sway bar, remove the rubber grommet from the parking brake cable guide that retains the ABS wire.
Now, remove the four 13mm sway bar retaining bolts and set the sway bar aside.
Remove the lower shock hardware from both sides with a 15mm socket on the bolt head and an 18mm socket on the nut.
Lower the rear end enough to remove both springs.
Use a pry bar if necessary to position the muffler away from the frame rail.
Position an 18mm socket and brake over bar on the bolt head.
Use a six inch extension, wobble adapter and 21mm socket on the nut inside of the torque box.
Remove the hardware.
Use the same size sockets on the axle side attaching hardware and then remove the factory control arm from the car.
Set the factory control arm and BMR control arm on a work bench.
Position them in a way so that the spring perches are even with each other.
Slide a factory bolt through the control arms to get them aligned.
Loosen the jam nut on the BMR control arm.
Rotate the rod end so that it is even with the factory control arm.
Finger tighten the jam nut and then get the factory control arm out of the way.
Now, verify that the heim joint is parallel with the body of the control arm.
Once parallel, tighten the jam nut.
Do the same for the other control arm.
Position the spherical bushing into the lower torque box.
Slide your bolt back through and loosely tighten the nut.
Swing the control arm up into the axle mount.
Align the bolt holes, reinstall the bolt and loosely tighten the nut.
Repeat these steps for the other side.
Reinstall the springs and jack up on the rear end.
Reinstall the lower shock hardware and loosely tighten.
Jack up on the rear end to establish some suspension pre-load.
For 79 to 98 applications, torque the lower control arm hardware to 83 lb-ft.
For 99 to 04 applications, torque the lower control arm hardware 131 lb-ft.
Torque the lower shock hardware to 59 lb-ft and then remove the rear end support.
Reinstall the sway bar in the correct orientation and torque the hardware to 41 lb-ft.
I did flip the angled bracket that secured the rubber grommet.
This is held in place with an 8mm bolt.
Reposition the rubber grommet.
Lubricate the bushings with a grease gun and polyurethane bushing grease.
This grease is normally very tacky and often times referred to as “marine” grease.
Reinstall the wheels and get the car on the ground.
Take it for a test drive and then you’re all finished.
From car up to car down, you’re probably looking at no more than two hours from start to finish. This is something you can do with some common hand tools within the comforts of your own garage.
To see more videos highlighting BMR Suspension components for your 1979 to 2004, go ahead subscribe to our YouTube channel. These BMR rear upper control arms are currently available from the real Mustang enthusiasts, LMR.com!