- Required: Selecting items described below in Steps 1-6.
- Options: Steps 7-9 are on the Options tab.
Step 1
Select the damper series and valving: Street, Sport, Race-2, or Race-3.
- For best performance and ride quality, the struts and shocks will be matched to the front and rear spring rates.
- See the Spring Rate tab for guidance and a list of spring rates that best match each MM Damper series.
Street series
- Street valved dampers are the perfect choice for high-performance Mustangs driven on the street, and even to occasional road course events.
- Designed to control mild coil-over spring rates.
- Provides excellent ride quality.
Sport series
- Sport valved dampers are best for Mustangs driven on the street that are also open-tracked or autocrossed.
- Designed to control moderate coil-over spring rates.
- Provides firm but not overly harsh ride quality.
Race-2 series
- Race-2 valved dampers are designed to control the softer end of the road course spring rate range.
- For Mustangs driven on bumpy tracks or rough autocross courses.
Race-3 series
- Race-3 valved dampers are designed to control the stiffer end of the road course spring rate range.
- For competitive road racing and serious open-tracking.
Step 2
Select your Caster Camber plate main plate finish:
- Black powdercoat finish
- None: If you already have MM Caster Camber Plates.
Step 3
Select the shock lower eyelet type.
Urethane bushings
Best for street-driven Mustangs because urethane provides noise isolation.
Spherical bearing
Best for track and competition use because it eliminates even the small amount of deflection that urethane allows, thereby improving damper function.
Notes
- MM installs the spherical bearings.
- The consumer installs the urethane bushings.
- MM offers conversion kits to change between a bushing and a bearing.
Step 4
Select the front spring rate.
- Need help choosing? See the Spring Rate tab for guidance.
Step 5
Select the rear spring rate. See the Spring Rate tab for guidance.
Using stock-location rear springs?
- If you choose a low front coil-over rate and plan to use stock-location rear springs, select, "I'm using stock-location rear springs."
- See the springs section for options.
Step 6
Select the rear coil-over kit.
Standard rear coil-over:
- Excellent for street and track applications.
- Includes all coil-over conversion parts, in addition to all upper end parts required to install second-generation MM shocks.
- See the MMCO-20 product page for details.
Competition rear coil-over:
- Excellent for racing and open-track applications.
- Only used with MM Racing Upper Shock Mounts: MMSM-1, MMSM-3, MMSM-5, or MMSM-12.
- Does NOT include MM Racing Upper Shock Mounts. Need them? see the "Options" tab.
- Includes all coil-over conversion parts, in addition to all upper end parts required to install second-generation MM shocks, EXCEPT the Racing Upper Shock Mounts.
- See the MMCO-21 product page for details.
Steps 1-6 are required.
See the Options tab for Steps 7-9.
The items listed below may be required for your particular installation.
Step 7
Do you need an MM Racing Upper Shock Mount?
If you selected the Competition Coil-over Kit (MMCO-21) and you do not already have the MMSM-1, MMSM-3, or MMSM-5, click here to order (2) Racing Upper Shock Mounts (MMSM-12).
Note
1 MMSM-12 is required per shock. 2 required per car.
Step 8
Do you need a second MM Shock-to-Axle Mounting Bracket?
Coil-over installation requires a robust lower shock-to-axle mounting bracket.
Step 9
Do you need a spanner wrench?
A spanner wrench is necessary to adjust ride height when using front springs with a rate less than 300 lb/in or rear springs with a rate less than 250 lb/in. Springs with a higher rate rarely need a spanner wrench for adjustment.
Benefits of a coil-over conversion:
- Improved performance for street-driven Mustangs without sacrificing ride quality when using moderate spring rates.
- Greatly improved performance for track-driven Mustangs with higher spring rates.
- Allows a large increase in the wheel rate, which reduces body roll when cornering, as well as brake dive.
- Eliminates friction in the control arm pivots, greatly improving both performance and ride quality.
- Adjust ride height easily.
- Set corner weights.
- Springs are available in a very wide range of rates, suitable for everything from street cruising to road racing.
- Makes it easy to swap out your springs for a different rate later.
- Everything you need for a coil-over conversion in one money-saving package.
- No need to piece together a kit from multiple sources.
- Non-adjustable valving lets you to enjoy driving without being distracted by the need to adjust your dampers.
Second-generation MM Shocks: Better by Design
- MM designed damping curve of each series' valving (Street-ST1, Sport-SP1, Race-RA2, and Race-RA3) matches with appropriate springs; see the Spring Rate tab.
- More efficient operation because the over-sized shaft reduces deflection.
- Mono-tube design provides better heat dissipation than twin-tube dampers, keeping the damper's oil cooler and decreasing heat-induced damper fade.
- Nitrogen gas pressure prevents oil foaming and fading.
- Coil-over ready without modification.
- MM Coil-over Kits use 2-1/4" rear spring for improved tire clearance.
- Robust "off road"-style shaft seal increases longevity.
- Option of spherical bearing with zero vertical deflection improves damper function.
- Integral bumpstop upgrades Fox Mustang bumpstop to improved SN95 style.
MM Struts: Better by Design
- MM designed damping curve of each series' valving (Street, Sport, Race-MM2, and Race-MM3) matches with appropriate springs; see the Spring Rate tab.
- Exclusive MM valving is the key to superb performance and good ride quality with aggressive coil-over spring rates.
- Robust high-grade alloy steel strut mounting ears on the proprietary MM-designed-and-manufactured housings prevent bending as a result of brake-reaction loads.
- Coil-over ready without modification.
- The inverted design allows large strut shaft bushings, for greater resistance to deflection from cornering loads.
- Reduced fading because of high gas pressure and monotube design.
MM Caster Camber Plates: Better by Design
Fits
Struts fit:
- 1987-1993 Mustang V8 spindles
- 1984-1986 SVO Mustang spindles
- All 1994-2004 Mustang spindles
- 1987-1988 Thunderbird Turbo Coupe spindles
- 1979-86 Mustang upgraded to 1987-1993 Mustang V8 or SN95 spindles
Note
Wide front wheels/tires often require 1/4" or thicker wheel spacers to provide clearance to the coil-over spring when used with
- 1987-1993 Mustang spindles
- 1984-1986 SVO Mustang spindles
Shocks fit
Shocks installed with a coil-over conversion require an MM Panhard Bar and/or MM Shock-to-Axle Mounting Brackets (MMSM-2), and then will fit:
- All 1986-2004 Mustang 8.8" solid axles
- All 1979-2004 7.5" solid axles
Does NOT fit
- 1979-1993 Mustang 4-cylinder and 6-cylinder spindles
- 1979-1986 Mustang V-8 spindles
- IRS-equipped Mustang
- Thunderbird
- Lincoln
I have a Mustang Cobra IRS in my Fox Mustang. Which package do I need?
We don't have packages listed for this, but we'll create a custom package just for you; contact us. For the rear it will have the parts for the Mustang Cobra IRS, while the front will have parts for your model year Mustang.
Do front coil-overs cause noise?
Not when properly designed and installed. But just as happens with many performance modifications, they will more readily transmit noise from other sources into the vehicle cabin. More noise transmission happens because the stock rubber upper strut mount is replaced by the spherical bearing in the caster camber plate. Generally, all you hear is a little more road noise from the tires. However, if something's amiss, in the brakes or suspension there may be more significant noise.
Do rear coil-overs cause noise?
Sometimes. The Mustang solid axle rear suspension allows enough articulation in some driving situations, typically when entering a steep driveway at an angle, that the shock will extend into droop far enough that the spring will lose tension. The loss of spring tension allows the spring to come loose from the upper perch; the spring may cause a little noise when it slips back into place on the upper spring perch as the suspension settles back down. Note that installing longer springs will not change this situation.
There is rarely an issue with the front coil-over springs losing tension, as the Mustang front suspension is independent. Similarly, the Cobra IRS rarely exhibits this issue.
Do I need an alignment after changing ride height?
Yes. Any change in ride height will cause the front camber to change. Any camber change will cause the toe setting to change. While a small change in ride height may not cause enough change in camber to require resetting the camber, that camber change will in turn cause the toe setting to change. If toe is incorrect by even a very small amount it will cause rapid tire wear.
Why is this package listed only for 1990-1993 Mustangs?
MM Caster Camber Plates are chassis specific. The caster camber plates in this package are part number MMCC9093, which only fits the strut towers of 1990-1993 Mustangs.
Why is the warranty only three years?
The warranty is not against parts wearing out. The warranty covers defects in materials and workmanship in manufacturing. If there was a problem in manufacturing, it will become apparent within three years.
Besides the many Tech pages listed on our FAQs & Tech Tips page, the following list is especially relevant to a coil-over conversion.
How do I choose which springs to use?
Choose springs that provide the handling characteristics and ride quality you want from your Mustang. To determine that:
- Decide on the performance goal for your Mustang.
- Consider how you'll use your Mustang most of the time; you want to optimize it for that type of driving.
- Consider what level of ride quality you want, and then decide what (if any) compromises you'll make to achieve your performance goal.
In general, start by selecting a front spring rate that's appropriate for your Mustang's intended use. Then pick the rear rate to match, taking into account the rear suspension type (4-link, torque-arm, etc.).
More specifically, see the MM Guide to Choosing Spring Rates and Dampers.
Which MM dampers go with which springs?
Choose your spring rates first. That choice dictates the damper series selection.
See the MM Guide to Choosing Spring Rates and Dampers.
- 3-year limited warranty on MM struts and shocks
- Limited lifetime warranty on MM Caster Camber Plates
For specific information on MM warranties, see the specific product pages:
MM warranties apply only to the original purchaser and original vehicle, are non-transferrable, and do not cover any other loss, liability or damage resulting from improper installation, handling, shipping, alteration, disassembly, service, repair, or use of this product. Should this product fail as a result of a defect in materials or workmanship within the warranty period, contact Maximum Motorsports by telephone at (805) 544-8748 for repair or replacement at manufacturer's option. All warranty returns must be shipped directly to Maximum Motorsports, regardless of where the product was originally purchased.
Note
Returns are not accepted without a Returned Goods Authorization (RGA) number. To obtain an RGA number contact Maximum Motorsports by telephone, email, or mail.
Repair or replacement as provided by this warranty is the customer's sole and exclusive remedy in the event of a product failure. Manufacturer shall not be liable for any incidental, consequential, or other damages resulting from the disassembly, handling, installation, service, repair, or use of this product.
Warranty Claims
- Contact Maximum Motorsports.
- We will assist you in evaluating the problem to determine if it is a candidate for possible warranty coverage. We may ask you to send us photos.
- If warranty coverage is a possibility, you will be given an RGA number to return the item to us. Items sent with no RGA number will be returned to the sender.
- You will then ship the damaged item to us (to the address on the Contact Us page), prepaid.
- Upon receipt we will evaluate the item.
- If your warranty claim is approved, we will ship the replacement component to you at no charge.