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Chassis and Suspension

Complete Suspension Kits

Front Suspension Kits

Speedway Mustang II IFS Kits

Part # 91034101

Chassis and Suspension

Complete Suspension Kits

Front Suspension Kits

Speedway Mustang II IFS Kits

Part # 91034101

Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles

Part # 91034101

Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles

Name: Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles
Brand: Speedway Motors
SKU: 91034101
Rating: 5 (2 reviews)

Speedway Motors

2 Reviews

61 Questions

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

Bolt Pattern:

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$1,342.99

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Product Summary

74-78 Mustang II, 74-80 Pinto, 75-80 Bobcat, Natural

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

See more details

Key Specs

MFG. Part #	Select Bolt Pattern
Brand	Speedway Motors
Front Suspension Type	IFS
Control Arm Style	Stamped
Spring Type	Coil Spring

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Installation Details

Installation Tips

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)

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Details

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

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)

Charts

Front Disc Brake Installation Instructions (PDF)

Installation Instructions(PDF)

Spindle Instructions (PDF)

Brake Kit Instructions(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.

Specifications

KEY SPECS
MFG. Part #	Select Bolt Pattern to see
Brand	Speedway Motors
Front Suspension Type	IFS
Control Arm Style	Stamped
Spring Type	Coil Spring

GENERAL
Suspension Height Adjustment	2 Inch Lowered
Shock Type	Twin Tube
Finish	Natural
Bolt Pattern	Select Bolt Pattern to see
Rotor Diameter	11 Inch
Spindle Style	Ford Custom
Dropped Spindles	Yes
Dropped Axle	No
Dropped Control Arms	No
Spindles Included	Yes
Steering Included	Yes
Welding Required	Yes