Select your desired installation method for the chassis mounting brackets
- Bolt-in: Requires good drill motor, selection of drill bits, and cutting oil.
- Weld-in: Requires MIG or TIG machine and skilled welder.
Select the bar size
Maximum Motorsports offers 9 different adjustable rear swaybars. Our Swaybar Comparison Chart shows the relative stiffness of each MM swaybar and how they compare to various stock rear swaybars. The choice of which swaybar to use depends on how you want to shift the handling balance of your car.
- Evaluate your car's handling balance and discern whether it tends to understeer (the front end pushes) or oversteer (the rear end is loose and comes around).
- Decide in which direction you want to shift the car's handling balance.
- On the Swaybar Comparison Chart, locate the swaybar that's currently on your Mustang, or the most similar one to it.
- Choose the MM swaybar that will shift the handling balance in the direction you want.
In general, understeer will be reduced by a stiffer rear swaybar. Oversteer will be reduced with a softer rear swaybar. Whenever a car is in the final stages of fine-tuning the handling balance, experimentation and testing will be required to achieve the optimum handling balance. Each of the MM Adjustable Rear Swaybars has four different adjustment positions. The difference from one position to the next is a 9% change in wheel rate. That's just enough of a change to be noticeable to a driver pushing the car near its limit.
Need help choosing a swaybar for your Mustang? Swaybar choice is an integral part of overall car setup. Other factors must be considered when choosing a swaybar rate, as everything interacts and affects handling. If you'd like help choosing a swaybar, start by sending us a completed SRRR form, which you can find linked from the end of this Tech Page.
As one's driving skill improves it becomes more apparent that improvements in handling come from ever smaller incremental changes in car setup. "Fine tuning" the car setup takes on a new meaning once your driving skill is greater than the car's ability to deliver handling performance.
Best handling usually comes from the neutral balance found on the knife-edge between understeer and oversteer. Having the ability to fine-tune the handling balance of your Mustang is critical to achieving the best possible performance. Maximum Motorsports' revolutionary bolt-in Adjustable Rear Swaybar provides the fine-tuning necessary to take your car to the limit!
The complete MM Adjustable Rear Swaybar Kit includes everything needed for installation.
- Black Zinc plated torsion bar with splines for swaybar arms
- Anodized aluminum swaybar arms with splines to match torsion bar
- Zinc-plated brackets to attach torsion bar to 7.5" or 8.8" rear axle housing
- Zinc-plated brackets (either bolt-in or weld-in design) to attach end links to frame rails
- Endlink sets made of spherical rod ends allow adjustment to eliminate swaybar preload
- Urethane bushings for torsion bar
- All hardware required for installation
Fits
- 1979-2004 Mustang with solid rear axle, 7.5" and 8.8"
- MM Panhard Bar
- Most aftermarket aluminum differential covers
Does NOTfit
- Ford 9" axle housing
- Some aftermarket Watts link kits
- Cobra IRS
Why is the MM Adjustable Rear Swaybar better than stock?
Because it attaches to the axle and the chassis. The OEM design mounts the swaybar to the lower control arms, which is a cheap way to do it, but this has some big drawbacks. The main one is that it reduces the effectiveness of the swaybar by acting on the chassis through the control arm bushings. The MM Adjustable Rear Swaybar mounts to the axle, and then acts directly on the chassis through endlinks with spherical rod ends.
The stock swaybar design adds an element of unpredictable binding to the rear suspension because its attachment to the rear lower control arms also constrains the articulation of the rear suspension. The MM adjustable swaybar functions solely as a swaybar, so it doesn't adversely affect rear suspension articulation.
How do I adjust the MM swaybar?
The stiffness of the swaybar is changed by moving the position of the endlinks on the swaybar arm. Moving the endlinks toward the torsion bar effectively shortens the swaybar lever arm, therefore increasing the wheel rate of the swaybar. Wheel rate refers to the rate of roll stiffness of the swaybar, as measured at the wheel. (Refer to the Tech tab for more information.)
We're working on FAQs for this product. If you have a question, please use our Contact Us page to email your question. We'll answer your question by return email, and also consider it for possible addition to this FAQ section.
A note of caution: One of the factors influencing total wheel rate is suspension bind. The total wheel rate is the sum of the swaybar's wheel rate, the wheel rate of the springs, and the wheel rate of any suspension bind. Potential binding of other companies' aftermarket control arms is something to take into consideration when trying to tune your Mustang's handling characteristics.
Road racers sometimes adjust their car's balance several times during a race weekend. Changing track conditions, deteriorating tire grip, and even different drivers will all require that changes be made to the rear roll stiffness to balance the car.
Drag racers use the largest of these rear swaybars to reduce squat of the rear passenger-side corner of the car. This ensures that both tires are receiving equal weight transfer and traction. Unlike similar "anti-roll bars" sold by others, the broad range of adjustment offered by the Maximum Motorsports Rear Swaybar leaves the car drivable on the street.
Street-driven cars benefit from the MM Rear Swaybar because it reduces the excessive body roll that comes with the use of comfortable, soft springs. The adjustability of the MM Rear Swaybar reduces the oversteer that causes unpredictable traction loss in wet weather. It's also a very handy tuning tool for dual-purpose cars that frequent the drag strip and/or the road course.