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$999.99
Mustang II IFS-Control Arms-Springs-Shocks-Dropped Spindles-5 on 4-1/2
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles

Mustang II IFS-Control Arms-Springs-Shocks-Dropped Spindles-5 on 4-1/2

74-78 Ford Mustang II, 74-80 Ford Pinto, 75-80 Mercury Bobcat, IFS Front Suspension Type

2 Reviews | 61 Answered Questions
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Lincoln, NE -
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Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS-Control Arms-Springs-Shocks-Dropped Spindles-5 on 4-1/2
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Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
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We estimate this item will ship on or before March 12th.
Part # 91034101-4 1/2
$999.99
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  • These kits are designed to work with most Speedway and Heidts crossmembers
  • Comes with new stamped steel upper and lower control arms with polyurethane bushings
  • Has 2" dropped spindles and new black stock-type springs
  • Includes an 11" brake kit featuring GM Metric-style calipers, with your choice of 5 x 4-1/2" or 5 x 4-3/4" bolt patterns
  • Fully compatible with your application based on which crossmember you have

Build Your Kit

You're almost there! This kit has an option or two for you to select. Let us know which options you want for your new kit.
Item 1 of 2
Mustang II Suspension Front Springs
Mustang II Suspension Front Springs
Quantity: 1
Item 2 of 2
Mustang II Power and Manual Rack & Pinions
Mustang II Power and Manual Rack & Pinions
Quantity: 1
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Details

Front Suspension Type:
IFS
Suspension Height Adjustment:
2 Inch Lowered
Control Arm Style:
Stamped
Shock Type:
Twin Tube
Spring Type:
Coil Spring
Finish:
Natural
Bolt Pattern:
5 on 4.5"
Rotor Diameter:
11 Inch
Spindle Style:
Ford Custom
Dropped Spindles:
Yes
Dropped Axle:
No
Dropped Control Arms:
No
Spindles Included:
Yes
Steering Included:
Yes
MFG. Part #:
91034101-4 1/2
Welding Required:
Yes

Info

With our complete Mustang II Independent Front Suspension kit you get brand new stamped steel upper and lower control arms with polyurethane bushings, steel 2" dropped spindles, Rubber Brake Lines, new black stock type springs & shocks, new manual rack & pinion with bushings or remanufactured power rack & pinion with bushings and an 11" brake kit featuring GM Metric-style calipers, with your choice of 5 x 4-1/2" or 5 x 4-3/4" bolt patterns.

  • Works with most Speedway and Heidts crossmembers (be sure to check control arm correspondence when choosing crossmember for your vehicle)
  • These kits are compatible with your application based on which crossmember you have.
  • Kit Includes:
    • New stamped steel upper and lower control arms with polyurethane bushings
    • 2" dropped spindles
    • New black stock-type springs
    • New shocks
    • Rack and Pinion with bushings and tie rods
    • 11" brake kit with GM calipers
  1. Crossmember NOT included - Add proper crossmember to complete kit.

Spring Rate Chart (Link)

WARNING: To offer our customers a better range of spring rates, the springs included in this kit are now black in color, please note that they are no longer chrome plated.

Note: These IFS kits will require use of strut rods and brackets for the lower control arms.  These kits will work with our replacement strut rod (91034315) and brackets (91034358).  If using the stock style control arms we suggest using the tubular strut rod number (91034322) for additional clearance and better suspension geometry.

Note: Additional items may be needed to complete installation.  You may want to include our Mustang II ride height adjusters (91034444) for installation with these IFS kits to fine tune your final ride height up to 2".

Note:  If using these kits with Speedway or Heidts crossmembers for 1948-1956 Ford Pickups, 1955-1959 Chevy Pickups, or universal crossmembers for 27-1/2" - 33-1/2" frame widths, you will be required to purchase 2" Inner Tie Rod Extensions (91034345) or (91034346).

Item Details

Must include Mustang II crossmember for complete installation (sold separately)

 

Notes

Note: Applications where the vehicle has fenders that mount directly on top of the frame, the fenders will require extensive modification to allow clearance for the upper cross member section.

Note:  Our Mustang II springs that we currently offer are all 13.5” long and require trimming to the length needed for each individual application. Weight rating changes as the spring is shortened. When installing in the vehicle the flat end goes up into the upper hat and the end with the “pigtail” goes down into the lower control arm. Spring is rotated when installing to position the pigtail properly. Springs TOO long will have a tendency to NOT sit properly on the lower arms and actually in some cases bow outward causing spring bind.

Note: These kits require the purchase of a Mustang II crossmember (sold separately).  Many of our Speedway and Heidts brand crossmembers will work with Manual Rack and Pinion Steering ONLY.  When purchasing our crossmembers, be sure to look for their correspondence with power racks if selecting a power rack with our Mustang II IFS kits.  With all Mustang II aftermarket crossmembers, spacers and longer bolts must be used with the later (Fox-body) power rack (spacers included).

Finding the right control arms means finding the correct track width: Our Mustang II kits feature 11" rotors.  Track width, which is hub faceto hub face where the wheels bolt on, will be 57.5". Wheel and tire combination and customer preference determine whether to use the
standard control arms or the 5/8" narrower. The narrower control arms reduce the track with by a total of 1.25".  See the link below for
various track widths with different options.

When used in conjunction with upgraded disc brake kits, due to possible interference between the end of the control arm and the brake rotor when at ride height, it may be necessary to remove minimal material from the end of the control arm to achieve adequate clearance at this location.

Mustang II Track Width Options (PDF)

Specs

Hub-to-Hub Kit (Less Crossmember)

  • New Control Arms
  • Polyurethane Bushings
  • New Strut Rods w/ Bushings
  • New Stock or 2" Dropped Spindles
  • New Black Painted Coil Springs
  • New Chrome Shocks
  • New Manual or Power Rack & Pinion
  • New Tie Rod Ends
  • New 11" Brake Kit
  • 5x4-1/2" or 5x4-3/4" Bolt Circle

Warranties

WARNING: DRIVING A LOWERED VEHICLE COULD BE DANGEROUS AND COULD CAUSE DAMAGE TO YOR SUSPENSION

The original intent of the air spring was to provide a very smooth ride.  It was not designed to provide an adjustable ride height.  You can not drive the vehicle at any ride height you select. 

All suspension systems are designed to operate at a specific midpoint position, with provisions for suspension travel. The Mustang II suspension is no exception. It has a specific mid-point position which is when the lower control arms are level. The suspension must be in this position to provide full suspension travel and correct geometry action.

In this type of suspension the shock is normally the bottom out device. When the vehicle is lowered the shocks compression and extension limits change and the shocks will bottom out or the ball joints could pinch when it is lowered. The air ride suspension is only designed to lower your vehicle while it is parked. If you attempt to drive a vehicle in the lowered position it could be dangerous and will cause damage to your vehicle. This could result in broken control arms, shocks and ball joints.

Charts

Front Disc Brake Installation Instructions (PDF)

Installation Instructions(PDF)

Spindle Instructions (PDF)

Brake Kit Instructions(PDF)

Some parts are not legal for use in California or other states with similar laws/regulations

Related Products

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Upper Mustang II Control Arm, 1974-1980 Stock Replacement
    Qty x 2
  • Mustang II Lower Control Arm, 1974-1980 Stock Replacement
    Qty x 2
  • Speedway Mustang II 2 Inch Drop Dropped Steel Spindles
    Qty x 1
  • Mustang II Suspension Front Springs
    Qty x 1
  • Monroe 32118 Monro-Matic Plus Mustang II Front Shocks
    Qty x 2
  • Mustang II Power and Manual Rack & Pinions
    Qty x 1
  • Speedway Mustang II Steering Rack & Pinion Mounting Bushing
    Qty x 2
  • Mustang II Outer Tie Rod End, Manual Version
    Qty x 2
  • Pinto-Mustang II Spindle Nut & Washer Kit
    Qty x 1
  • GM Metric Caliper Bracket Set for Mustang II Spindle
    Qty x 1
  • IMCA Approved 1978-88 GM Metric RH Brake Caliper, 7/16-20 Inlet
    Qty x 1
  • IMCA Approved 1978-88 GM Metric LH Brake Caliper, 7/16-20 Inlet
    Qty x 1
  • Speedway 1974-80 Ford 11 Inch Front Disc Brake Rotors
    Qty x 2
  • Speedway Soft Street Brake Pads, GM Metric 1978-Up D154
    Qty x 1
  • Bearing-Seal Kit for Two Mustang II Brake Rotors
    Qty x 1
  • Speedway Mustang II Front Suspension Strut Rod Bushing Kit
    Qty x 1
  • Speedway Mustang II Front Suspension Replacement Strut Rod
    Qty x 2
  • Speedway Mustang II Upper Control Arm T-Bolts
    Qty x 1
  • Bolt Kit - Mustang II Lower Arm
    Qty x 1
  • Nut Kit, Mustang II Strut Rod
    Qty x 1
  • Mustang II Rack & Pinion Bolt Kit
    Qty x 1
  • Mustang II Strut Rod Brackets
    Qty x 1
  • 9/16 Inch Fine Thread Tie Rod Nuts
    Qty x 1
  • Speedway Mustang II Coil Spring Rubber Isolator Cushion
    Qty x 1
  • Mustang II Rack & Pinion Bolt Kit - For Use With Rack Spacers
    Qty x 1
  • Front Disc Brake Hardware Kit
    Qty x 1

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