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MM K-member for engine swap, Mustang, 1979-1995

MMKM-2.1
Pricing: $699.97
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Description

Allows easier engine swapping! This hybrid k-member bolts into a 1979-1995 Mustang chassis, and has the engine mounting pads and steering rack location to allow fitment of these engines:

  • 5.0L Coyote (2011-2014 and 2015+) See Coyote Fitment tab
  • 4.6L/5.4L modular
  • 3.8L V6
  • LSX

Get more front grip and dramatically improve the handling of your Mustang with an MM tubular K-member. At 39 lb, the MM K-member is 22% lighter than the OEM K-member, and yet it's the strongest, stiffest, and most durable K-member available.

New!
Updated design for better fitment with 2015+ Coyote engines. All MMKM-2.1 k-members shipped after 8/1/18 are of the new design.

Better by design
MM's Engineering Team optimized the suspension geometry to increase cornering grip and produce a better-handling Mustang. A design goal was to maximize stiffness, as that keeps the suspension geometry stable when cornering. The added stiffness makes the handling more precise and increases stability under braking.

Like the OEM K-member, MM K-members are designed and built to last for the life of your Mustang. While most aftermarket K-members focus on shedding weight, our design priorities led us to create advanced cross-bracing and triangulation of tube intersections to ensure the strength and durability needed for this mission-critical part. We use thicker-gauge metal and larger tube sizes than other companies to ensure the MM K-member has the strength to handle drag race launches and wheel stands, road race use, and of course the rigors of daily street driving.

MM K-members in the news
See the Articles tab.

Required for installation

  • Tubular front control arms
  • Front coil-over conversion with high-performance struts
  • MM Aluminum Steering Rack Bushings
  • Caster camber plates
  • Bolt-through-style bumpsteer kit
  • 4.6L modular engines that have an OEM oil cooler require an Oil Filter Relocation Kit
  • Short swaybar endlinks
  • Front swaybar relocation brackets required with non-offset and forward-offset Front Control Arms
  • Universal Front Swaybar Bushings required with non-offset and forward-offset Front Control Arms
  • Coyote engine requires 1996-2004 4.6L V8 engine mounts

Recommended

  • Solid steering shaft
  • Strut tower brace
  • Front swaybar bracket reinforcements (1979-1993 only)

Notes

  • For installing a 5.0L, 302, 351W, 2.3L engine in a 1979-1995 Mustang, use the MMKM-1.
  • Stock front control arms won't fit because of the large size of the pivot bushings.
  • For 1979-1993 Mustangs, we make 3 different front control arms. Each does something different:
    • maintains the stock fore/aft tire location
    • shifts the tires forward 0.75"
    • shifts the tires forward 1.5"
  • For 1994-1995 Mustangs, we make 2 different front control arms. Each does something different:
    • shifts the tires forward 0.75"
    • shifts the tires forward 1.5"
  • Installation with 3.8L V6 engine requires 1996-2004 V6 engine mounts.
  • Has clearance for Canton 15-784 oil pan.
  • LSX engines require fabrication of engine mounts, or Ford modular engine mounts can be modified to fit the LSX block.

Related products

  • Complete MM K-Member packages
  • Front control arm rearward pivot hardware (MMF-6)
  • Engine mounts
  • K-member Spacers

Benefits

  • Allows swapping a 4.6L/5.4L modular, 3.8L V6, 5.0L Coyote, or LSX engine into a 1979-1995 Mustang chassis. This hybrid k-member bolts into a 1979-1995 Mustang chassis, but has the engine mounting pads and steering rack location to allow fitment of a 4.6L/5.4L modular, 3.8L V6, 5.0L Coyote, or LSX engine.
  • Improves suspension geometry. The MM K-member has two sets of holes for mounting the front control arm pivots. The lower holes are raised 1" from the stock position. The upper holes are raised 2". This allows installing the front control arms in the best pivot location to optimize the roll center height and improve the camber gain for the ride height you choose for your Mustang.
  • Front control arm mounts are shifted 0.75" straight forward. This increases positive caster and moves the center of gravity slightly rearward for improved weight distribution with the non-offset and forward-offset front control arms.
  • Forward shift of the control arm location increases the Ackerman steering effect with the non-offset and forward-offset front control arms, which improves initial corner turn-in and reduces understeer.
  • Lighter weight than a stock K-member: Installation of complete MM K-member system reduces vehicle weight by nearly 40 lbs.
  • After extensive testing of different anti-dive geometries, we determined that Ford got it right! The stock amount of anti-dive provides the best performance, and that's what we build into the MM K-member. Increasing anti-dive geometry over the stock amount, as some other K-members do, causes the suspension to bind during hard braking and makes the front brakes lock up easily.
  • Improves maintenance access.
  • Designed to make steering rack removal easier than with stock K-member or other aftermarket K-members.
  • Stiff design prevents flexing, which improves steering response and handling.
  • Tough enough for street, strip, and road course use.
  • Precisely located holes allow easy use of plumb bob strings to square the K-member to the chassis during installation.

Features

  • Raised front control arm pivot points; 2 positions accommodate the ride heights of both street-driven Mustangs and race cars.
  • Control arm pivot points move straight forward 0.75".
  • Fore/aft tire location is determined by which MM Front Control Arm you choose. See the Fitment tab for tables showing the front tire location when various MM Front Control Arms are installed with any of the MM K-members.
  • Accepts fitment of other aftermarket front control arms that replicate the stock control arm pivot bushing locations, and have smaller-than-stock bushings.
  • Includes a 2-point chassis brace (both stock and aftermarket K-members need a brace).
  • Control arm pivot points located the same distance from the vehicle centerline as 1987-1995 V8 Mustangs (further than 1979-1986 Mustangs).
  • Maintains stock engine mount height for best oil pan clearance.
  • Maintains stock 4.6L engine fore/aft location.
  • No modifications needed to the engine mounts, unlike many other aftermarket K-members that require removing the anti-twist feature.
  • Includes features to ease squaring to the chassis during installation.
  • Includes 2 MM Low-Profile Front Control Arm Bolts for improved clearance between the rubber steering rack boot and the heads of the two forward pivot bolts.
  • Superb installation instructions
  • Black powdercoating for protection and good looks
  • Designed by the MM Engineering Team.
  • Track tested by winning American Iron racers: too many to count.
  • Made by MM in San Luis Obispo, California. Beware of poor-quality copies made overseas!

Fitment

Fits
1979-1995 Mustang with one of these engines:

  • 4.6L modular, 2V and 4V
  • 5.4L modular
  • 3.8L V6
  • 5.0L Coyote (does NOT require oil filter relocation kit) See Coyote Fitment tab
  • LSX

  • Most aftermarket tubular front control arms
  • 4.6L modular engines that have an OEM oil cooler require an Oil Filter Relocation Kit
  • MM Forward-offset Front Control Arms require Front Swaybar Relocation Brackets
  • Installation with Coyote engine requires 1996-2004 4.6L V8 engine mounts.
  • Installation with 3.8L V6 engine requires 1996-2004 V6 engine mounts.
  • Has clearance for Canton 15-784 oil pan.
  • LSX engines require fabrication of engine mounts, or Ford modular engine mounts can be modified to fit the LSX block.

Does NOT fit:

  • Hellion turbo kit on 4.6L modular engine. Use MMKM-3.1
  • Stock Ford front control arms
  • Stock location springs; coil-over conversion is required
  • 1996-2004 Mustang chassis
  • Any steering rack bushings other than MMST-6

Tables below show the front tire location when various MM FCAs are installed with any MM K-members.

1979-1993 Mustang
MM Control Arm Part No. Fore/aft Tire Location
Reverse-offset MMFCA-20,21 Stock
Non-offset MMFCA-1,2 & MMFCA-14,15 0.75" forward
Forward-offset MMFCA-4,5 1.5" forward

 

1994-1995 Mustang
MM Control Arm Part No. Fore/aft Tire Location
Non-offset MMFCA-7,8 & MMFCA-17,18 0.75" forward
Forward-offset MMFCA-10,11 1.5" forward

Coyote Fitment

2015+ Coyote engine fitment
The 2015+ Mustang GT Coyote engines have Charge Motion Control Valves (CMCV), also known as intake manifold runner controls. The manifold runners have air valves that are moved by vacuum motors located at the back of the intake manifold. The movement is controlled by the ECU. The purpose is to provide better idle control and higher torque at low RPM's. The GT350 intake manifold also has CMCV and the vacuum motors.

The Problem
The CMCV vacuum motors on a 2015+ Coyote engine interfere with the Fox/SN95 firewall when the engine is mounted in the typical location, as dictated by standard 4.6L motor mounts.

Ford Performance no longer sells production 2011-2014 Coyote engines. The only production engines they sell now are 2015+ models.

Solutions
  • Mount the engine 0.7" further forward than the location set by standard 4.6L motor mounts. See "Relocating the engine" below for how to do this.
  • Remove the vacuum motors, which will require modifications to the intake manifold to disable the CMCV, along with a custom engine tune.
  • Install a 2011-2014 GT intake manifold, which does not have CMCV, and which will require a custom engine tune.
  • Install a Boss 302 manifold, which does not have CMCV, and which will also require a custom engine tune.
Relocating the engine
  • Different motor mounts are required. Currently available motor mounts can be modified to move the engine 0.7" forward: 6-504-BL or MMSMM-2.
  • Coming soon! Use our new solid motor mounts that do not require modification to mount the engine forward.
  • Coming soon! Use our new urethane mounts that do not require modification to mount the engine forward.

MM K-member changes for engine relocation
We changed our MMKM-2.1 K-member to accommodate the Coyote oil pan when the engine is moved forward. The only change is to the design of the brace for the main tube. The new design provides clearance for the relocated oil pan.

  • All MMKM-2.1 K-members shipped after August 1, 2018 are of the new design.

The original MM K-member design can be modified to eliminate the interference. Fabrication and welding are required. Contact the MM Tech Department for details.

Wheel/Tire Fitment

Fore and Aft Wheel Location
The fore-aft location of your Mustang's front tires may change after installation of an MM K-member and Front Control Arms. How much it changes depends on the specific combination of parts you install. Scroll down to see images showing the results of several combinations of parts installed on SN95 Mustangs.

Required Modifications
1979-1993 Mustang
Any combination of K-member and front control arms that moves the front tire location forward will often require some modifications. How much modification depends on the tire size, wheel offset, and how far forward the tire goes. In general, likely modifications include trimming the plastic fender extensions, remounting the plastic inner fender liner, and adding a spreader bar to the fender under the extension.

1994-1995 Mustang
All combinations of MM K-members and MM Front Control Arms move the front tire location forward. Some may require slight modifications; how much depends on the tire size, wheel offset, and how far forward the tire goes. In general, 0.75" rarely requires any modifications unless an uncommonly large tire/wheel package is installed. 1.5" of movement may require modifications to the plastic inner fender liner, and trimming the end of the bumper fascia inside the wheel well.

For more information about these modifications, email the MM Tech Department from the Contact Us page. Be sure to include the part numbers of the K-member and front control arms you will use, as well as the year, model, and sub-model of your car.

Note differences in control arm position

The images above show the results of several combinations installed on a 1994-2004 Mustang.

Left image: No change in tire location, using either:

  • Stock K-member and stock front control arms
  • Stock K-member and MM Non-Offset Front Control Arms

Middle image: Tire moved forward 0.75", using either:

  • MM K-member and MM Non-Offset Front Control Arms. The MM K-member adds 0.75" of forward offset.
  • Stock K-member and MM Forward-Offset Front Control Arms. The MM Forward-Offset Front Control Arms add 0.75" of forward offset.

Right image: Tire moved forward 1.5", using:

  • MM K-member and MM Forward-Offset Front Control Arms. The MM K-member adds 0.75" of forward offset and the MM Forward-Offset Front Control Arms add another 0.75" of forward offset, totaling 1.5" forward offset.

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