Mustang II IFS w/ New Stock Control Arms and Dropped Spindles, Air Ride
- Works with all Speedway and Heidt's Mustang II crossmembers
- Features air springs for the ulitmate in adjustable ride height
- Common GM metric calipers with a 2-3/8" bore for proven braking performance and serviceability
- 11" vented rotors dissipate heat and create more torque on the wheel - available with 5 on 4-1/2" or 5 on 4-3/4" bolt pattern
- 2" dropped spindles are constructed of 1045 heat-treated alloy steel for strength and retain factory geometry for years of service
- 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 steel spindles
- Air springs with shocks
- Rack and Pinion with bushings and tie rods
- 11" brake kit with GM calipers
- Crossmember NOT included - Add proper crossmember to complete kit.
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: 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 DetailsMust include Mustang II crossmember for complete installation (sold separately)
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: 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 face to 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.
WarrantiesWARNING: DRIVING A LOWERED VEHICLE COULD BE DANGEROUS AND COULD CAUSE DAMAGE TO YOUR 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.
Spindle Instructions (PDF)
What's In The Kit
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Q & A
Learn about the importance of getting the chain tension set correctly, and why it is critical that we get it as near perfect as we can. Walkthrough a basic procedure that effectively and consistently gets the chain tension set properly every time.
Pat shows how his air ride is setup in his 1964 Impala.
Learn the proper method of blocking a race car in this step-by-step procedure to follow when performing this task. Learn why consistency is important and a few "not-to-do's".
Learn about Speedway Motor's Fully Assembled Rear Control Arm Kit and how it saves time and hassle. In this video, Joe and Kyle explain the benefits of this new product.
AccuAir and Speedway Motors team up to bring you a video series explaining the basics of air suspension. Watch these videos to get a better understanding of air suspension.
Pat gives a brief overview of air ride and parts we have to offer for air ride.
Looking for a cost effective way to upgrade the front of your car? This article shows the steps to replace upper and lower stock control arms with tubular control arms for added suspension strength.