A-Body Mopar- Street Connection Suspension Kit
$11,750.00
IN STOCK
Street Connection Options
(Satin Black w/ Gloss Black Letters)
(Billet Master Cylinder Black)
Moser Trutrac (For included Ford 9 inch housing)
Stainless steel Flaming River U-joints and shaft
Configured total
$11,750.00
FREIGHT SHIPPING REQUIRED
Due to the size and configurable nature of this product, freight shipping is not included in the purchase price or checkout total. After your order is received, Hammer Fab will determine the final packaged dimensions and weight and obtain a freight quote based on your delivery location and requirements. We will contact you with the freight cost before your order ships. Freight charges must be paid in full prior to shipment.
Commercial addresses with a loading dock or forklift may reduce freight costs. Residential delivery, liftgate service, and other special delivery requirements may result in additional charges.
11 REQUIRED OPTIONS REMAINING
Details
Street Connection A-Body Mopar Suspension & Chassis System
Complete Performance Suspension System for A-Body Mopars
Transform the stance, handling, steering, and overall driving experience of your A-Body Mopar with the Street Connection Suspension & Chassis System by Hammer Fab.
Street Connection was developed to replace outdated factory suspension and steering components with a modern, integrated system—without sacrificing street manners, serviceability, or the character of the car.
Rather than combining unrelated aftermarket parts, we've engineered the front suspension, steering, chassis reinforcement, rear suspension, and available brake and driveline components to work together as a complete package.
What This Package Delivers
- Modern rack-and-pinion steering
- Adjustable coilover suspension
- Improved suspension geometry and alignment capability
- Excellent street ride quality
- Improved handling and cornering stability
- Modern brake and drivetrain options
- Increased chassis rigidity
- Proper wheel and tire fitment
- Aggressive stance without sacrificing real-world drivability
- Components engineered to function together as a complete system
This is an engineered suspension and chassis system—not simply a collection of parts.
What This System Does
A quick summary of the four areas this system addresses. Full detail for each is covered in the sections below.
Front Suspension
Replaces the factory K-member, torsion bars, and steering gearbox with a Hammer Fab Street Connection K-member (bolt-in or weld-in), Detroit Speed rack-and-pinion steering, RideTech adjustable coilovers, Mustang-style upper and lower control arms with rubber bushings, Wilwood Pro dropped spindles, and Hammer Fab billet aluminum dropped steering arms.
Rear Suspension
A triangulated four-link with RideTech R-Joints and adjustable rear coilovers, a heavy-duty Ford 9" housing with Torino-style ends and GearFX 31-spline axles, fixture-built TIG-welded rear-end brackets, and 10-gauge weld-in crossmembers. Optional splined rear sway bar, Baer SS4 rear brakes, and upgraded third-member and axle configurations.
Chassis
Weld-in 10-gauge laser-cut L-channel mid-frame stiffeners, contoured from 3D scans of the factory floor, tie the front and rear structures together. They weld to the factory floor pan and do not require cutting the floor, and are especially recommended above roughly 350 horsepower. Rear frame stiffening plates and weld-in crossmembers add further rigidity.
Engine Compatibility
- Big Block Mopar — B/RB 361, 383, 400, 413, 426, 440
- LA Small Block Mopar — 273, 318, 340
- Gen III Hemi — Hellcat applications require editing sheet metal
- Custom engine combinations — the bare-steel K-member allows experienced builders to fabricate their own engine mounts
Rear-sump oil-pan requirements vary by engine; see Engine Fitment below. If your engine combination is not listed as a supported configuration, contact Hammer Fab before ordering.
Front Suspension System
The Street Connection front suspension replaces the factory K-member, torsion-bar suspension, and steering gearbox with a modern coilover and rack-and-pinion system engineered specifically around the A-Body Mopar chassis.
Base Front Suspension Includes
- Hammer Fab Street Connection K-member
- Can be installed as a bolt-in or weld-in unit
- Fixture-built for repeatable fitment
- Designed around multiple engine configurations
- Detroit Speed rack-and-pinion steering
- Replaces the factory steering gearbox
- Uses conventional tie-rod ends
- Designed for clean steering geometry without unnecessary bulky bump-steer hardware
- RideTech adjustable coilovers
- Eliminates the factory torsion bars
- Adjustable ride height
- Improved suspension control and handling
- Upper and lower control arms
- Mustang-style architecture
- Simplified camber and caster adjustment using alignment shims
- Built with -6 degrees of caster and approximately -0.5 degrees of camber at ride height with full vehicle weight on the suspension
- Rubber bushings provide comfortable street manners without the harshness associated with polyurethane, Delrin, or solid rod-end configurations
- Wilwood Pro dropped spindles
- Hammer Fab billet aluminum dropped steering arms
Chassis Reinforcement
Street Connection incorporates chassis reinforcement designed to make the unibody structure work more effectively with the upgraded suspension.
Mid-Frame Stiffeners
Our weld-in mid-frame stiffeners—or frame connectors—tie the front and rear chassis structures together.
They are especially recommended for vehicles producing more than approximately 350 horsepower.
Unlike conventional tubular frame connectors, our stiffeners are manufactured from 10-gauge laser-cut steel and designed from 3D scans of the factory floor.
Why We Use an L-Channel Design
- Rigidity: Heavy 10-gauge steel adds substantial structural support.
- Accurate fitment: Contoured using 3D scan data to follow the factory floor.
- Reduced welding distortion: Welding along a single primary edge helps reduce floor-pan warpage.
- Moisture management: The open L-channel design avoids creating enclosed moisture traps.
- Corrosion protection: All sides of the material remain accessible for proper coating and paint.
Installation requires welding to the factory floor pan but does not require cutting the floor.
Rear Suspension System
The Street Connection rear suspension completes the chassis transformation with a triangulated four-link system designed for articulation, strength, adjustability, and predictable street handling.
Rear Suspension Includes
- Triangulated four-link suspension
- RideTech R-Joints for articulation and strength
- Adjustable geometry
- Designed for street performance and ride quality
- Heavy-duty Ford 9" rear housing
- Supplied in raw steel
- Torino-style housing ends
- GearFX 31-spline axles
- Additional axle and gearing configurations available depending on selected components
- Fixture-built TIG-welded steel rear-end brackets
- RideTech adjustable rear coilovers
- Adjustable ride height
- Multiple spring-rate options available
- 10-gauge steel weld-in crossmembers
- Tie into the factory floor pan and side frame rails
- Designed to increase chassis rigidity
- Rear frame stiffening plates
- Manufactured from 10-gauge steel
- Require welding, fitting, and finish grinding during installation
Optional Rear Suspension Upgrades
- Rear splined sway bar
- Upgraded third-member and axle configurations
- Baer SS4 rear brakes
Brake System Options
Street Connection can be configured with upgraded Baer braking components to complement the increased suspension and chassis capability.
Available Brake Upgrades
- Baer T4 front disc brakes
- Signature satin-black calipers
- Gloss-black lettering
- 5x4.5" and 5x4.75" bolt-pattern configurations available
- Baer SS4 rear disc brakes
- Signature satin-black calipers
- Gloss-black lettering
- Baer ReMaster master cylinder package
- Billet master cylinder
- Proportioning valve
- Brake line kit
- Two residual-pressure valves
Select the appropriate brake and bolt-pattern configuration for your wheel and axle combination.
A minimum 18" wheel is required with the Baer brake packages on all Street Connection kits.
Handling Upgrades
For customers looking for maximum street handling performance, Street Connection can be equipped with our splined sway-bar system.
Superior Handling Package
- Heavy-duty front splined sway bar
- Rear splined sway bar
- Billet/engineered mounting components
- Designed to reduce body roll and improve cornering stability
- Engineered to complement the Street Connection suspension geometry
Ford 9" Third-Member Options
Available third-member configurations include:
- Moser third member
- 31- or 35-spline configurations depending on axle selection
- Multiple commonly used gear ratios
- Higher or lower gear ratios available by special request
Proper gearing should be selected based on your engine, transmission, tire diameter, and intended use.
Engine Fitment
The Street Connection K-member was developed and tested around real A-Body Mopar installations rather than theoretical dimensions alone.
Big-Block Mopar
Our test vehicle, the 1967 Barracuda "SLOBAK," has been used extensively to develop and validate the system with a 440 big-block Mopar.
The combination fits:
- Under the stock hood
- Without cutting the factory floor pan
- With approximately 4" of oil-pan ground clearance when configured appropriately
A modified Dodge truck rear-sump oil pan is required for this configuration.
Small-Block Mopar
The system has also been fitted and tested with a 340 small-block Mopar in a 340 Formula S.
This configuration requires:
- Dodge truck rear-sump oil pan
- Appropriate oil pickup
The oil pan can be modified for additional ground clearance but modification is not mandatory.
Gen III Hemi
Gen III Hemi installations require the appropriate rear-sump oil-pan configuration.
We also offer Street Connection-specific stainless-steel Gen III Hemi headers designed around our K-member, steering, and suspension package.
Other Engine Combinations
The bare-steel K-member architecture allows experienced builders to fabricate custom engine mounts for additional engine combinations.
If your engine combination is not specifically listed as a supported configuration, contact Hammer Fab before ordering.
Street Connection Gen III Hemi Headers
Our optional stainless headers were developed specifically around the Street Connection K-member and A-Body engine compartment.
Header Construction
- 1/2" thick laser-cut stainless-steel cylinder-head flanges
- 316L raw-textured stainless construction
- 1-7/8" primary tubes
- TIG-welded construction
- Fixture-built for consistent fitment
- 3" V-band collectors
Designed Around Real Installation Requirements
The headers are engineered with consideration for:
- Driver-side starter clearance
- Passenger-side starter clearance
- Street Connection K-member clearance
- Steering clearance
- Suspension adjustment and service access
These headers are sold in the configuration in which they were developed and tested to ensure proper fitment.
Additional Available Upgrades
Depending on your build configuration, Street Connection packages can also be equipped with:
- Baer front and rear brakes
- Baer ReMaster master cylinder system
- Front and rear splined sway bars
- Moser third member
- 31- or 35-spline axle configurations
- Multiple rear gear ratios
- Steering-shaft U-Build-It kits
- Street Connection Gen III Hemi stainless headers
- Additional drivetrain and chassis components as available
Engineering & Development
Street Connection was developed using a combination of modern engineering technology and real-world fabrication experience.
- Designed using 3D scanning and CAD
- Fixture-built components for repeatable fitment
- Developed around actual A-Body Mopar chassis
- Tested on real vehicles
- Designed for alignment accuracy and predictable suspension geometry
- Engineered around real-world wheel, tire, engine, and ground-clearance requirements
- Built with serviceability and street use in mind
- Designed to minimize unnecessary chassis modification
Installation
Street Connection is intended for experienced builders, fabrication shops, and mechanically capable enthusiasts.
Installation requires a combination of:
- Mechanical assembly
- Welding
- Measuring and fitting
- Suspension setup
- Alignment
- Brake and steering system installation
Detailed instructions and instructional video resources are available to help guide installation.
Once installed, the system provides straightforward adjustment of ride height, alignment, suspension settings, and available handling components.
Installation & Fabrication Requirements
- Bolts in: the Street Connection K-member can be installed as a bolt-in unit, along with the control arms, coilovers, spindles, steering arms, rack-and-pinion, and brake components.
- Requires welding: mid-frame stiffeners, rear crossmembers, rear frame stiffening plates, and the rear four-link mounting structure. The K-member may also be welded in if preferred.
- Requires fabrication: fitting and finish grinding of stiffening plates, oil-pan and clearance work depending on engine choice, and customer-fabricated engine mounts for combinations outside the supported list.
- Not required: cutting the factory floor pan.
- Skill level: intended for experienced builders, fabrication shops, and mechanically capable enthusiasts with welding, measuring, suspension setup, and alignment capability.
Shipping, Freight & Delivery
Street Connection packages contain large, heavy, and oversized components. Shipping requirements vary based on the options selected.
- Freight / LTL shipping is required for this product and is not included in the product or checkout total. Hammer Fab will calculate and contact the customer with the freight charge separately after the order is placed based on the final configuration and shipping destination.
- Large components such as rear-end housings and other oversized items ship via LTL freight.
- Certain products may ship separately or directly from their respective manufacturer.
- Multiple shipments may be required to complete your order.
- International orders require a manual invoice. Please contact us before ordering so we can assemble the appropriate package and shipping arrangements.
- Lead times vary depending on configuration, component availability, and made-to-order items.
For shipping questions or assistance with an international order, contact info@hammerfab.com.
Fitment & Ordering Notes
- Verify your vehicle, engine, transmission, wheel, tire, brake, and bolt-pattern configuration before ordering.
- Some components are configuration-specific and are not interchangeable between every combination.
- Welding and fabrication are required for portions of the installation.
- Custom engine combinations may require customer-fabricated engine mounts or other modifications.
- Proper rear gearing should be matched to engine characteristics, transmission gearing, converter or clutch configuration, and tire diameter.
- Contact Hammer Fab before ordering if you're unsure which options are appropriate for your build.
Installation & Testing Resources
Street Connection Installation Videos: Click Here
See Street Connection in Action: Click Here
Interested in Having Hammer Fab Install Your Kit? Click Here
Common Questions
Answers below are based on the current A-Body Mopar Street Connection system configuration and how it is sold today.
Are wheels and tires included?
No. Wheels and tires are not included with the Street Connection system.
What wheel bolt pattern does the kit use?
5x4.75" is the Hammer Fab standard bolt pattern, and the kit is typically built for that pattern. 5x4.5" is available by request — customers can confirm their preferred bolt pattern with us after placing the order.
What is the minimum wheel size?
A minimum 18" wheel is required with the Baer brake packages on all Street Connection kits.
What alignment settings is the system built around?
The A-Body system is built with -6 degrees of caster designed into the geometry, with camber at approximately -0.5 degrees at ride height with the full weight of the car on the suspension.
Will the car need an alignment after installation?
The front suspension comes with baseline alignment shims that will get the alignment close enough for low-speed drivability and loading. A professional alignment should be performed before driving the vehicle at normal road speeds.
Does Street Connection replace the factory torsion-bar front suspension?
Yes. The system replaces the factory K-member, torsion bars, and steering gearbox with a Hammer Fab Street Connection K-member, coilover suspension, and Detroit Speed rack-and-pinion steering.
Does it use rack-and-pinion steering?
Yes. A Detroit Speed rack-and-pinion steering system replaces the factory steering gearbox and uses conventional tie-rod ends.
What coilovers does the system use?
RideTech adjustable coilovers are used front and rear, with multiple spring-rate options available.
Can the K-member be bolted in?
Yes. The Street Connection K-member can be installed as a bolt-in unit or welded in. The rest of the system — including mid-frame stiffeners, rear crossmembers, and rear four-link structure — still requires welding.
Does installation require welding?
Yes. Welding is required for the mid-frame stiffeners, rear crossmembers, rear frame stiffening plates, and rear four-link mounting structure. The K-member may be bolted in or welded in depending on preference.
Does the floor need to be cut?
No. Installation does not require cutting the factory floor pan. The mid-frame stiffeners weld to the factory floor.
How difficult is installation?
Street Connection is intended for experienced builders, fabrication shops, and mechanically capable enthusiasts. Installation involves mechanical assembly, welding, measuring, fitting, suspension setup, and alignment.
What engines are supported?
The Street Connection K-member is designed for Big Block Mopar, LA Small Block Mopar, and Gen III Hemi applications. Hellcat swaps require editing sheet metal. The bare-steel K-member also allows experienced builders to fabricate custom engine mounts for other combinations.
If your engine combination is not listed as a supported configuration, contact Hammer Fab before ordering.
What rear suspension does it use?
A triangulated four-link with RideTech R-Joints and adjustable rear coilovers, tied to a heavy-duty Ford 9" housing with Torino-style ends and GearFX 31-spline axles.
Is a Ford 9-inch rear included?
Yes, the Ford 9" housing is included in the base kit. The third member / gear unit is a separate selection configured during ordering.
Are sway bars available?
Yes. Front and rear splined sway bars are optional add-ons for customers who want increased cornering capability.
What brake options are available?
Optional Baer T4 front disc brakes, Baer SS4 rear disc brakes, and a Baer ReMaster master cylinder package are available as upgrades.
Is freight included in the checkout total?
No. Street Connection ships via LTL freight. Freight is not included in the checkout total and is invoiced separately after the order based on final configuration and destination.
Can Hammer Fab install Street Connection?
Yes. Contact Hammer Fab through the contact page to discuss installation options.
Bottom Line
Street Connection transforms the A-Body Mopar into a more capable, predictable, and enjoyable car without losing what makes these cars cool in the first place.
Modern steering. Adjustable suspension. Increased chassis rigidity. Serious braking and handling capability. And, just as importantly, the stance to match.
We've done the engineering, fabrication, fitment, and real-world testing so the individual components work together as a complete system.
Tested. Refined. Built to drive.
WARNING: This product can expose you to chemicals, including lead, which are known to the State of California to cause cancer and reproductive harm. For more information, please visit www.P65Warnings.ca.gov.