1937-39 Chevy Truck IFS Crossmember, Mustang II Front Suspension. Front steer rack-and-pinion steering provides greater steering feel. Complete weld-in assembly made from 3/16-inch steel adds strength. Vertical inner uprights provide a strong design with twice the weld area. Application specific crossmember and spring towers pre-welded to save installation time.Allows for numerous control arm and disc brake kit upgrade options. Compatible with manual or power rack-and-pinion steering systems. Compatible with stock stamped steel control arms as well as tubular control arms. Stock style control arms will require strut rod brackets or tubular strut rod kit. Rack-and-pinion mounting points rotated rearward 20 degrees for steering shaft clearance. Built-in anti-dive and bump steer correction mounting points. Lower control arm pivot tubes and corner gussets not included. Accepts stock Mustang II spindles or aftermarket drop spindles. All welds ground smooth, saving you time and energy during installation. Much like the advent of hydraulic, or "juice" brakes, became an industry standard, so has independent front suspension (IFS). These updates are what can turn a long drive at highway speed in your'37-'39 Chevy truck hot rod from sketchy to serene simply by replacing the outdated straight axle suspension and its kingpins and dual leaf springs for a well-engineered weld-in IFS solution utilizing the tried and true suspension geometry that debuted on the 1974 Mustang II. Built Strong to Handle the Road Ahead and Look Good Doing It. Like most trucks built in this time, they were designed for hauling and not personal or recreational use like we enjoy our trucks today. To that end, GM opted for the frugal, yet strong straight beam front axle suspended by a leaf spring at each side. Great for the rutted dirt roads going from the farm into town carrying crops, but terrible for today's road manners and speeds. Of course, there is always the effect of alignment on a front suspension and getting a straight axle front end aligned is no small chore, often requiring heating/bending of the axle tube itself or other modifications. Beginning with our 7 gauge steel (that's a full 3/16 of an inch thick) boxed Mustang 2 front suspension crossmember that is fully welded with extended vertical uprights we have designed in anti-dive geometry to our crossmember and spring towers. Suspension travel, which yields a better ride, is upwards of five inches with our IFS and aligning the IFS can be handled easily by any competent alignment shop. Rack-and-pinion steering provides a quick and crisp steering effort at any road speed, and we have designed our rack mounting tabs to not only be optimized to eliminate bump steer but lay the steering rack back at a 20 degree angle to facilitate a lower steering shaft angle. This helps with exhaust manifold/header and overall engine clearance. The mounts accept both 15-1/2-inch and 16-inch on center rack mount spacing for use with manual or power steering assemblies. Stock height Mustang II spindles will result in a typical 3-4-inch drop in ride height. Lastly, upgrading to a weld-in IFS Mustang 2 front end kit greatly enhances your braking options with the ability to run the most basic disc brake package all the way up to serious multi-piston racing disc brakes. Track width is dependent upon the brake package you choose, usually adding up to 2-inches to the IFS, creating a 56-1/2-inch to 58-1/2-inch hub-to-hub width. As you can see, our crossmember is the perfect foundation for building the best Mustang II front suspension for your'37-'39 Chevy truck.
Welds to Your Stock Frame Rails for Strength and Accuracy. We understand that bolt-in suspension upgrades are easier for those that like to spin their own wrenches, but we designed our Mustang II crossmembers to be a weld-in solution to maintain their strength and integrity throughout the life of your'37-'39 Chevy truck.
While we do encourage the use of a certified welder or chassis shop for installation, if you know your way around a measuring tape and have a MIG welder in your garage there's really nothing stopping you from following our detailed instructions to fit and weld our Mustang II front suspension crossmember into your'37-'39 Chevy truck's frame rails. Welding our Mustang II suspension crossmember into place is a straightforward installation and can be handled in just a few short hours once the old straight axle and front suspension have been removed.If you are going to use stock-style lower Mustang 2 control arms you will need or our for installation. Note, lower control arm pivot tubes and gussets are not included, as they are typically included with tubular style lower control arm kits. We offer with and without disc brakes to help you complete your installation. Lastly, if using a power rack-and-pinion steering unit you will need our for proper clearance along with the corresponding. 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. 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. 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'. Lower control arm pivot tubes and gussets are NOT included.
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). 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. Includes crossmember and shock cups. By Rob on March 23, 2018. Yes, I recommend this product. Related Items / Suggested Parts. Tubular Control Arms, Stock Springs, Dropped Spindles. Mustang II IFS, Tubular Control Arms, Coilover Springs, Dropped Spindles. Control Arms, Air Ride, Dropped Spindles, Wilwood Brakes. Mustang II IFS, Short Control Arms, Air Ride, Stock Spindles, Wilwood Brakes. Mustang II IFS, Stock Control Arms, Springs, and Shocks, Dropped Spindles. Mustang II Coilover IFS w/ Stock Control Arms, Coilovers, Dropped Spindles. Mustang II IFS w/ New Stock Control Arms and Stock Spindles, Air Ride. Mustang II IFS w/ New Stock Control Arms and Dropped Spindles, Air Ride. Mustang II Tubular Lower Arms for Air Ride/Wilwood Brakes No Strut Rod. Mustang II Tubular Lower Arms, Air Ride/Wilwood, No Strut, 5/8 In.
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