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  1. Maximum Motorsports IRS Street Rear Grip Package
    $927.75

    Improve handling and reduce wheel hop with this complete Rear Grip Box for IRS-equipped Mustangs. MM delivers on the unfulfilled promises of the stock IRS. Enjoy the superior ride quality of a street-oriented IRS without sacrificing performance. This rear Grip Box will transform your Cobra into a true high performance automobile, with world-class handling and traction.

    Benefits

    • Eliminates deflection allowed by stock rubber bushings
    • Greatly reduces wheel hop because there is no bushing deflection
    • Precisely locates the control arms for improved dynamic alignment
    • Handling is greatly improved because there are no unpredictable camber changes caused by bushing deflection
    • NVH and ride comfort virtually unchanged
    • Installation tools included, the key to a hassle-free installation

    This Grip Box includes:

    • Urethane Differential Bushings - MMIRSB-45
    • Delrin Upper Control Arm Bushings - MMIRSB-2
    • Delrin Lower Control Arm Bushings - MMIRSB-1
    • Urethane Subframe Bushings - MMIRSU-1
    • Adjustable Outer Tie-Rod Ends - MMIRSTR-1
    • Adjustable Rear Swaybar Endlinks - MMRSB-94
    • Specialty tools and detailed instructions to make the job a breeze

    IRS Tech
    MM delivers on the unfulfilled promises of the stock IRS. Enjoy the track performance and reliability of an MM-equipped Mustang IRS. This rear Grip Box will transform your Cobra into a true high performance automobile, with world-class handling and traction.

    Handling is improved and wheel hop reduced by eliminating deflection allowed by the stock rubber control arm bushings. Delrin bushings precisely locate the rear control arms, and maintain rear wheel alignment in a manner that is impossible with the compliant stock rubber bushings. Rubber bushings provide barely adequate suspension control. They cannot accurately position the control arms well enough to achieve maximum performance from the suspension.

    Wheel hop is a major complaint about IRS-equipped Mustangs. The un-damped compression of the rubber bushings in the rear suspension is the primary cause of wheel hop. That un-damped movement is amplified by repeated loss of traction. Wheel hop occurs because the rear tires continually oscillate between losing and then regaining traction. The extremely soft stock rubber bushings are the biggest contributor to this oscillation. The rubber compresses easily and then springs back, over and over again. To reduce wheel hop the stock rubber bushings must be eliminated.

    Learn More
  2. Maximum Motorsports IRS Race Rear Grip Package
    $1,247.73

    This Grip Box takes the Super Street/Competition IRS Grip Box a step further, providing pinion angle adjustability and a solid differential mount. Improves handling and reduces wheel hop.

    Benefits

    Eliminates deflection allowed by stock rubber bushings.
    Greatly reduces wheel hop because there is no bushing deflection.
    Precisely locates the control arms for improved dynamic alignment.
    Handling is greatly improved because there are no unpredictable camber changes caused by bushing deflection.
    Installation tools included, the key to a hassle-free installation.

    This Grip Box includes:

    Aluminum Differential Bushings - MMIRSB-40.1
    Delrin Upper Control Arm Bushings - MMIRSB-2
    Delrin Lower Control Arm Bushings - MMIRSB-1
    Urethane Subframe Bushings - MMIRSU-1
    IRS Adjustable Complete Tie-Rod Kit - MMIRSTR-2
    Adjustable Rear Swaybar Endlinks - MMRSB-94
    Low Profile Subframe Bolts, rear mounts - MMF-1
    14MM Subframe Hardware, front mounts - MMF-4
    Specialty tools and detailed instructions to make the job a breeze

    What's different from the MMRG-21.5 Super Street/Competition Grip Box?
    The urethane differential mounting bushings are swapped for aluminum, which also provides adjustment for pinion angle.

    IRS Tech

    MM delivers on the unfulfilled promises of the stock IRS. Enjoy the track performance and reliability of an MM-equipped Mustang IRS. This rear Grip Box will transform your Cobra into a true high performance automobile, with world-class handling and traction.

    Handling is improved and wheel hop reduced by eliminating deflection allowed by the stock rubber control arm bushings. Delrin bushings precisely locate the rear control arms, and maintain rear wheel alignment in a manner that is impossible with the compliant stock rubber bushings. Rubber bushings provide barely adequate suspension control. They cannot accurately position the control arms well enough to achieve maximum performance from the suspension.

    Wheel hop is a major complaint about IRS-equipped Mustangs. The un-damped compression of the rubber bushings in the rear suspension is the primary cause of wheel hop. That un-damped movement is amplified by repeated loss of traction. Wheel hop occurs because the rear tires continually oscillate between losing and then regaining traction. The extremely soft stock rubber bushings are the biggest contributor to this oscillation. The rubber compresses easily and then springs back, over and over again. To reduce wheel hop the stock rubber bushings must be eliminated.

    Learn More
  3. Maximum Motorsports 99-01 Cobra IRS Maximum Grip Box  - GB-10
    $5,481.25

    Maximum Motorsports 99-01 Cobra IRS Maximum Grip

    NOW AVAILABLE for IRS-equipped Cobras!

    The MM Maximum Grip Box includes what you need to bring the performance of your IRS-equipped Mustang Cobra up to the same high level that MM parts have done for the solid-axle equipped cars The MM Maximum Grip Box is quiet and composed enough for a street car, yet fast enough for the track.

    The IRS Maximum Grip Box Includes:

  4. MM Strut Tower Brace 1
  5. MM K-Member
  6. MM Front Control Arms w/ urethane bushings
  7. MM Front Coil-Over Conversion Kit
  8. MM Adjustable Tie-Rod Ends
  9. MM IRS Subframe Bushings
  10. MM IRS Delrin Rear Lower Control Arm Bushings
  11. MM IRS Delrin Rear Upper Control Arm Bushings
  12. MM IRS Sway Bar End Link kit
  13. MM Rear Coil-Over Conversion Kit
  14. MM XL Series Full-Length Subframe Connectors
  15. MM Caster/Camber Plates 1
  16. MM Aluminum Steering Rack Bushings
  17. MM Aluminum Differential Mounts
  18. MM IRS Rear Adjustable Tie-Rod Ends
  19. Bilstein HD Struts*
  20. Bilstein HD Shocks*, (grooved for coil-over use)
  21. Hypercoil front and rear Coil-over springs
  22. Solid steering shaft
  23. Urethane front and rear swaybar bushings
  24. Urethane front swaybar endlinks


  25. *The Bilstein struts and shocks are included in the Maximum Grip Box for the 1999 and 2001 Cobra. They are not included in the Maximum Grip Box for the 2003-04 Cobra because those cars came equipped with Ford-specific Bilsteins. The OEM Ford Bilsteins are different for the hardtop and convertible cars. Each type is suitable for a certain range of coil-over spring rates. Call the Lethal Performance Tech Line for details. For stiffer spring rates, MM will soon have available MM Sport-valved Bilstein struts and shocks, as well as Race-valved versions.

    1-Available with triple-plated chrome finish. CC = $50 extra, STB = $120 extra. Note if you want chrome in the special order instructions during checkout. Learn More
  • Maximum Motorsports 99-04 Cobra "The Basics" IRS Grip Package
    $548.00

    Reduce IRS wheel hop and improve handling with this Delrin Control Arm Bushing Package for upper and lower control arms. Fits 1999-2004 Mustang Cobra

    Eliminates deflection allowed by stock rubber upper and lower control arm bushings.
    Greatly reduces wheel hop because there is no bushing deflection.
    Precisely locates the upper and lower control arms for improved dynamic alignment.
    Handling is greatly improved because there are no unpredictable camber changes caused by bushing deflection.
    NVH and ride comfort virtually unchanged.
    Much easier to install than urethane control arm bushings.
    Installation tools included.
    This package includes MMIRSB-1 and MMIRSB-2.

    Innovative design features:

    Stainless steel shims included for custom-fitting each bushing and arm combination to the subframe. This accommodates the very large OEM production tolerances in the fore and aft position of the control arm mounting tabs on the IRS subframe. The distance between the forward and rearmost tabs for the lower control arms can vary by over 1/4"! This works fine for the pliable factory rubber bushings, but not when trying to improve performance with precision-machined bushings. Our custom-fitting process uses stainless steel shims to ensure that the control arms cannot shift forward or rearward because of the factory production tolerances. This is yet another MM innovation copied by those lacking MM's engineering and design talent.
    The shims are installed under the shoulder of the bushing to allow easy installation of the assembly into the subframe.
    Delrin bushing shoulders are chamfered for ease of installation, and to reduce sliding-friction contact area with the subframe tabs.
    For the highly loaded lower control arms, double-shouldered front and rear bushing sets are used to evenly spread acceleration and braking loads into the subframe. Thrust forces, caused by braking and acceleration, highly load the lower control arms along the pivot axis of the bushings. These loads are taken up by the bushing shoulders and passed into the control arm mounting tabs. The MM lower arm bushings have a shoulder on both sides of each bushing set. This lets both bushing sets on each control arm transmit these thrust loads into the subframe. For the upper control arms we are able to utilize less expensive single-sided bushings because the thrust loads into the bushings are much lower than the loads coming from the lower control arms.
    Lower control arm bushings have crush sleeves made of thick-walled aluminum, and are hard anodized to reduce wear.
    Upper control arm crush sleeves are made of zinc-plated steel.
    Tab straightening tools, designed by MM, are included to assist in flattening the subframe tabs before reinstalling the control arms with the new Delrin bushings. The mounting tabs are always distorted by the original installation of the control arms on the assembly line. Tab straightening is a critical step that ensures that the control arms pivot freely, without binding.
    Tooling is included to easily remove the original bushings. Designed by MM, these tools make bushing removal an easy job of only a few minutes, instead of an hours-long nightmare.
    PTFE-based lubricating grease is included. This is one of the best greases in the world, and is successfully used in applications a thousand times harsher than Mustang control arm bushings.
    Gloves are included to keep the super-sticky grease off your hands.

    For more details and technical information, scroll down.

    Handling is improved and wheel hop reduced by eliminating deflection allowed by the stock rubber control arm bushings. These Delrin bushings precisely locate the rear control arms, and maintain rear wheel alignment in a manner that is impossible with the compliant stock rubber bushings. Rubber bushings provide barely adequate suspension control, albeit the best noise and vibration reduction, but they cannot accurately position the control arms well enough to achieve maximum performance from the suspension.

    Wheel hop is a major complaint about IRS-equipped Mustangs. The un-damped compression of the rubber bushings in the rear suspension is the primary cause of wheel hop. That un-damped movement is amplified by repeated loss of traction. Wheel hop occurs because the rear tires continually oscillate between losing and then regaining traction. The extremely soft stock rubber bushings are the biggest contributor to this oscillation. The rubber compresses easily and then springs back, over and over again. To reduce wheel hop the stock rubber bushings must be eliminated.

    Learn More
  • Maximum Motorsports 99-04 Cobra Super Street/Competition IRS Grip Package
    $1,077.69

    This Grip Box takes the Street IRS Grip Box a step further, enhancing performance to be suitable for competition. Improves handling and reduces wheel hop.

    Benefits

    Eliminates deflection allowed by stock rubber bushings
    Greatly reduces wheel hop because there is no bushing deflection
    Precisely locates the control arms for improved dynamic alignment
    Handling is greatly improved because there are no unpredictable camber changes caused by bushing deflection
    NVH and ride comfort virtually unchanged
    Installation tools included, the key to a hassle-free installation

    This Grip Box includes:

    Urethane Differential Bushings - MMIRSB-45
    Delrin Upper Control Arm Bushings - MMIRSB-2
    Delrin Lower Control Arm Bushings - MMIRSB-1
    Urethane Subframe Bushings - MMIRSU-1
    IRS Adjustable Complete Tie-Rod Kit - MMIRSTR-2
    Adjustable Rear Swaybar Endlinks - MMRSB-94
    Low Profile Subframe Bolts, rear mounts - MMF-1
    14MM Subframe Hardware, front mounts - MMF-4
    Specialty tools and detailed instructions to make the job a breeze

    What's different from the MMRG-21 Street Grip Box?

    The complete adjustable tie-rod kit is substituted for the outer tie-rod end bumpsteer kit.
    Low profile subframe mounting bolts are added to improve clearance for wide tires.
    14MM mounting hardware is included to replace the stock 12MM hardware at the forward subframe mount that allows undesirable movement.

    IRS Tech

    MM delivers on the unfulfilled promises of the stock IRS. Enjoy the track performance and reliability of an MM-equipped Mustang IRS. This rear Grip Box will transform your Cobra into a true high performance automobile, with world-class handling and traction.

    Handling is improved and wheel hop reduced by eliminating deflection allowed by the stock rubber control arm bushings. Delrin bushings precisely locate the rear control arms, and maintain rear wheel alignment in a manner that is impossible with the compliant stock rubber bushings. Rubber bushings provide barely adequate suspension control. They cannot accurately position the control arms well enough to achieve maximum performance from the suspension.

    Wheel hop is a major complaint about IRS-equipped Mustangs. The un-damped compression of the rubber bushings in the rear suspension is the primary cause of wheel hop. That un-damped movement is amplified by repeated loss of traction. Wheel hop occurs because the rear tires continually oscillate between losing and then regaining traction. The extremely soft stock rubber bushings are the biggest contributor to this oscillation. The rubber compresses easily and then springs back, over and over again. To reduce wheel hop the stock rubber bushings must be eliminated.

    Learn More
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