These Speedway Mustang IFS kits for 1955-1959 Chevy passenger cars are natural conversions to improve your vehicle's suspension, handling, and overall performance. The Chevy models have frames and fenders which lend themselves nicely to the Mustang front end conversion, without changing the critical geometry. Like our Ford kits, Chevy kits do not bumpsteer at all. Included in these kits are illustrated installation instructions.
- Mounting points of all control arms match the original Ford design
- Factory anti-drive built right in
- 1955-1959 Chevy Pickup frames
- All Speedway crossmembers come in Deluxe versions (welds ground)
- Constructed of 7-gauge steel
- Mustang II cross members using stock spindles will drop the stock ride height 3-4”
- One-Piece Shock Cups are T.I.G. welded in place and have anti-dive built in.
- Vertical Inner Uprights. This is the strongest design available, with twice the weld area. This will keep your frame from twisting!
- Crossmember and Spring Towers precut and pre-welded to fit your frame
- Lower control arm pivot tubes and gussets are NOT included
- Frame Front Boxing Plates are available for added strength/support (91054429)
- Works with both manual or power rack and pinions
- Requires use of 2" inner tie rod extensions
Choose from the crossmembers below and add to an IFS kit to get a "hub to hub" front suspension.
Mustang II Crossmember Application Chart (Link)
910-34429 Crossmember Installation Instructions (PDF)
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 crossmembers to fine tune your final ride height up to 2". Frame boxing plates (91054429) are also available for these crossmembers for added strength and support. You must use 2" inner tie rod extensions for proper steering geometry with these crossmembers.
Note: This crossmember requires the use of rack extensions (91034345) for the manual or the power rack. Further, rack spacers are also required when a power rack is used. Please consider item #910-34346 or 910-1023.
In a word, "handling". While installing a Mustang II can look like a lot of work, in reality, the improved handling and ride quality are worth the effort. Combine that with improved stopping ability due to numerous brake options and it becomes more a question of “Why wouldn’t you?”. The independent suspension will give you a much better ride because there is double the suspension travel. A stock axle will give you maybe 2-1/2” of total travel vs. a Mustang II which will give you about 4-1/2”- 5” of travel. There are multiple spring rates available to accommodate varied applications and the rack and pinion steering is much more responsive than a standard steering box.
Drop: This varies and is dependent on application and options. Most kits drop the vehicle by 3-4”. Drop spindles and running lower profile tires than stock also adds to the amount of drop that can be achieved.
Track Width: You may want to mount custom wheels to your Mustang II conversion and determining proper track width for your application is essential for figuring correct backspacing and overall ride stance. Standard wheel base is 56-1/2” with a 60” version available for trucks. The various options for brake kits will vary this somewhat and some kits can add roughly 2” to the overall track width. Narrowed arms are available to move the wheel in by 5/8” on each side. See the link below for various track widths with different options.
Mustang II Track Width Options (PDF)
Assembly Notes: Either manual or power steering can be used with these crossmembers. The passenger side mount has a slot that will take the later model power rack. With all Mustang II aftermarket crossmembers, spacers and longer bolts must be used with the later (Fox-body) power rack.
Rack mounts are incorporated into the crossmember design and rotate the rack back 20° to get the input shaft lower. Stock, manual, power racks, or later model Mustang II or T-Bird power racks can be used. The rack is positioned so the bellows will clear most aftermarket full A-Arms. You must use 2" inner tie rod extensions for proper steering geometry with racks for these crossmembers. When using crossmembers with our "power" steering rack, you may also need (2) rack spacers (9101023). (These spacers are included with our Mustang II suspension kits.)
The holes for the lower control arms are 1/2″ (stock). If you will use tubular lower A-Arms instead of the stock lower arms, the lower pivot holes will have to be drilled out to 5/8″.
These crossmembers will work with stock control arms. If used with stock arms, these will require strut rods and strut mounts for installation. Speedway crossmembers DO NOT include strut rod mounting brackets. We recommend either our offset or no-strut control arms or the tubular strut rod (91034322).
1955-59 Chevy Pick-Up
(requires use of longer tie rod ends)
Complete installation may require you to purchase corresponding a-arms, shocks, springs, brake kit, spindles, and steering rack and pinion