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New! Read the article Maximum Motorsports Tames Fox & SN95 Mustang Rear Suspensions on FordMuscle.com.

MRT Exhaust! MM now offers premium MRT cat-back exhaust systems for 1996-2004 Mustangs.

New! for Street & Strip Mustangs! Big-bore rear wheel cylinders for 1979-1993 Mustang with 9" drum brakes. Improves braking when running big rear tires and front skinnies, and/or different OEM front brakes.

New! Swapping a Coyote into a Fox Mustang? MM's Hydroboost Conversion Kits allow easy installation of a 1996-2004 Mustang Hydroboost power brake assist unit into a 1979-1993 Mustang.

New! Swapping an IRS into your Fox Mustang? MM makes it easier with a brake line kit made just for this conversion. Bolts-in, with no cutting or flaring of brake lines. Designed to fit standard IRS brake hoses.

New! MM's billet aluminum Pedal Box Spacer for Fox Mustangs. Replace the breakage-prone OEM plastic spacer when converting to manual brakes or Hydroboost.

Canadians! Please read the latest about ordering from Canada/shipping to Canada.

/DRIVE
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Competition Coil-over Kit fits Black Series MM Shock with MM Racing Upper Shock Mount
Actual product may differ from photo.
  • Competition Coil-over Kit fits Black Series MM Shock with MM Racing Upper Shock Mount

click on thumbnail to zoom

$129.97

  • Item # MMCO-23
 

 

Competition Coil-over Kit
Fits:
  • Black MMD-RC1xxxx Series shocks
  • MM Racing Upper Shock Mount

This coil-over kit will install 1 Black Series MM Shock in a 1979-2004 solid-axle equipped Mustang along with an MM Racing Upper Shock Mount. Attaches the MM shock to the MM Racing Upper Shock Mount installed on the chassis.

Includes threaded coil-over sleeve and upper and lower spring perches for 1 shock. For coil-over applications and an MM Racing Upper Shock Mount only.

Does NOT include MM shock, MM Racing Upper Shock Mount, or coil-over spring. Purchase those items separately.

Notes
  • 1 kit fits 1 shock. 2 kits required per car.
  • Fits Black 3rd Gen MM shocks only (NOT included). These shocks are black and have a shaft with a 5/8" major diameter.
  • Black Series part numbers have this format: MMD-RC1xxxx
  • The Black Series is the third generation of MM shocks. Includes Street-ST1, Sport-SP1, Race-RA1, and Race-RA3.
  • Requires MM Racing Upper Shock Mount (NOT included).
  • Requires 2.25" coil-over spring (NOT included).
  • For new installation use MMSM-12 Racing Upper Shock Mount.
  • Also fits previously installed Racing Upper Shock Mounts MMSM-1, MMSM-3, and MMSM-5. Some of the previously installed components of those kits will not be reused.
  • Does NOT include coil-over spring
  • For coil-over applications only
Required
  • Black Series MM Shock, 1 per MMCO-23 (2 required per car)
  • MM Racing Upper Shock Mount
  • 2.25" Coil-over spring
  • Shock-to-axle mounting brackets

Coil-over installation requires a robust lower shock-to-axle mounting bracket.

Spanner Wrench Tool
A spanner wrench is necessary to adjust ride height when using springs with a rate less than 250 lb/in. Springs with a higher rate rarely need a spanner wrench for adjustment.

Related products

Includes all coil-over conversion parts, except the spring, to install 1 Black Series third-generation MM shock, along with an MM Racing Upper Shock Mount, for a coil-over conversion in 1979-2004 Mustang chassis equipped with a solid axle.
Installs 1 Black Series 3rd Gen MM shock to an MM Racing Upper Shock Mount in a coil-over conversion:
  • Threaded sleeve
  • Upper spring perch
  • Lower spring perch with locking screw
  • Shaft retaining nut
  • Shock shaft spacers
  • Circlip to support threaded sleeve
  • Order 2-1/4" coil-over springs separately.
  • Fits 1 shock. 2 MMCO-23 kits required per car.
Fits
  • 1 shock. 2 MMCO-23 kits required per car.
  • Black Series third-generation MM shocks. These shocks are black and have a shaft with a 5/8" major diameter. Black Series part numbers have this format: MMD-RC1xxxx.
  • MMSM-12 Racing Upper Shock Mount
  • MMSM-1, MMSM-3, and MMSM-5 Racing Upper Shock Mounts. Some of the previously installed components of these kits will not be reused.
  • 1979-2004 Mustang chassis
  • Solid axle
  • Coil-over installation only
Requires
  • Black Series MM Shock, 1 per MMCO-23 (2 required per car)
  • MM Racing Upper Shock Mount
  • 2.25" Coil-over spring
  • Shock-to-axle mounting brackets
  • If you have an MM Panhard Bar, the axle mount does double duty as the lower shock mount for the driver side. Only 1 shock-to-axle mounting bracket (MMSM-2) is required for the passenger side.
  • If you don't have an MM Panhard Bar, you'll need 2 of the shock-to-axle mounting brackets (MMSM-2).
Does NOT fit
  • Yellow Series 2nd Gen MM shocks, which have a yellow shock body. Yellow series requires MMCO-21.
  • MM 1st Gen yellow shocks having a shaft with a major diameter of 11mm.
  • Bilstein shocks.
  • Any shock other than the Black Series third-generation MM shocks. Black Series part numbers are in this format: MMD-RC1xxxx.
  • Non-coil-over installation.
  • Mustangs without MM Racing Upper Shock Mounts.

Note
MMSM-2 does NOT include the lower shock mount bolt (12mm by 70mm, grade 10.9) and matching nut.

We are working on FAQs for the MMCO-23 Coil-over Kit. If you have a question, please use our Contact Us page to email your question to us. We will answer your question by return email, and also consider your question for possible addition to this FAQ section.
You can read Maximum Motorsports' highly detailed MMCO-23 Competition Coil-over Kit installation instructions before purchase.