Versatile Compatibility: Universal four-link suspension kit that works with both unibody and full frame vehicles, mountable inside or outside of frame rails to accommodate various car designs., Improved Performance: The parallel four-link suspension design eliminates pinion angle changes on hard acceleration, increasing efficiency and control during high-speed runs., High-Quality Construction: The 3/4\" rod ends and 1\" OD threaded steel tubes ensure rigidity, while the 7-gauge brackets mounted in double shear add to the strength and longevity of the setup., Complete Control: Must be used with a lateral axle control device such as a Panhard bar or Watts link for complete rear suspension control, ensuring total axle command and improved vehicle handling., Adjustable Setup: Comes with adjustab Universal Drag Race H.D. Parallel 4-Link Rear Suspension Kit Sku # 91649068 Mfr. Part # 91649068 Condition New Brand Speedway Motors Sold Each Details Info
- Parallel 4-link suspension system works with full frame or unibody vehicles
- Locates axle and prevents rotation/pinion angle change
- Requires a Panhard bar or Watts link system for total axle control
- Weld on 7 gauge brackets place tubular links in double shear mounting for strength
- Large 3/4-inch rod ends, and 1-inch steel link tubes easily handle high horsepower
- Multiple link points to square the rear axle, change instant center, and more
- Includes weld on upper shock mounts and adjustable bolt on lower mounts
- Works with coil spring or air spring mount kits or coilover shocks
- Can be installed inboard or outboard of frame rail as needed for clearance
Give Your Racecar a True Adjustable 4-Link Rear Suspension for Better Control
A “fixed” suspension with no adjustment is fine for street use and low horsepower applications. In most cases what the factory engineer designed for suspension pivot points, spring rates, pinion angle, and more are all a series of compromises in packaging and cost by the manufacturer. Trying to put 500 or more horsepower down on a dragstrip surface with drag radials or slicks is asking for major wheel hop or broken parts as leaf springs wrap up, triangulated four-links bind, and more. All these factory compromises do nothing for maintaining pinion angle and eliminating axle movement. Bolt on traction aids like help limit pinion angle changes but do nothing to change roll center or anti-squat. The only way to adjust these settings is with an adjustable rear suspension and one of the most popular options is a parallel four-link suspension setup.
The parallel four-link suspension is just as it sounds, four links (two upper and two lower) that are parallel to each other connecting the axle housing to the vehicle’s frame or unibody. The parallel 4-link suspension locates the rear axle assembly, centering it in the rear wheel opening, and prevents pinion axle changes during hard acceleration. Furthermore, the four-link suspension design allows squaring the axle in the chassis so that there is no deviation on the rear thrust angle, provides the user with the ability to adjust the instant center in relation to the car’s center of gravity (hint, a lot of math is involved). Making these changes also provides for changes in anti-squat, which further aids in tuning the 4-link rear suspension and chassis to the horsepower level, traction ability of the track surface and your rear tires, and more for the best launch possible.
Our Parallel Four-Link Suspension Works in Most Any Chassis Style
No matter if you’re looking to race a full frame pickup or a unibody muscle car like a Camaro or Mustang, our universal 4-link kit can be fitted to your ride. The frame brackets are made from 7 gauge steel for strength and are designed to be welded to any structural part of the frame or unibody (some vehicles may require additional reinforcement or a crossmember added for the correct placement of the frame brackets). The axle brackets feature a 3-inch radius to fit common 3-inch axle tubes, such as those found on the venerable . Both provide double shear mounting of the adjustable suspension links for strength. Adjustable rear shock mounts allow you to position the lower shock mount for the correct shock distance per your shock manufacturer. The 1-inch steel link bars use heavy duty 3/4-inch rod ends with left and right threads, allowing easy on vehicle adjustments for pinion angle and axle centering. We provide plenty of link mounting hole options to plot and set your suspension’s instant center and anti-squat for your horsepower level, track conditions, and more.
The parallel 4-link rear suspension ultimately controls axle location fore/aft and pinion angle, but you will need either a or to control lateral axle movement. While some four-link suspension setups use an angled track bar, these can flex under hard acceleration, we much prefer the Panhard bar or Watts link options, even though they can limit the use of full exhaust tailpipe routing to the rear of the car if you’re looking to retain a full exhaust system.
The adjustable shock mounts are designed for use, but if you prefer to run a traditional spring, or even an adjustable ride height , you can run a fixed or adjustable on these mounts as well.
Absolute Traction on The Track or Street Is Just an Adjustment Away
No other factory suspension provides the ability to adjust your vehicle’s traction capabilities like an adjustable parallel four-link suspension setup. Very few aftermarket rear suspensions offer this adjustment ability as many are focused on performance street use or road course ability. So, if you’re goal is to make it from point A to point B on a 1/4-mile (or 1/8-mile) dragstrip with the maximum traction available, you’ll want an adjustable parallel 4-link suspension like this. As track conditions change, tire temperatures change, or you add or take away horsepower in your tune, or weight in your chassis, having the ability to quickly make rear suspension link adjustments (along with shock tuning) will ensure your ride goes down the track straight as a string without any drama so you can focus on the win.
Kit Includes:
- Frame brackets
- Rear-axle brackets
- Upper and lower shock brackets
- 3/4” rod ends / 5/8\" hole
- Jam nuts
- 14” threaded 1” O.D. tubes
- Bolts and washers
Specs
- Axle Bracket Height: 11-5/8\"
- Axle Bracket Width: 4-1/16\"
- Axle Bracket Thickness: .177\"
- Frame Bracket Height: 11-5/8\"
- Frame Bracket Width: 4-3/4\" max
- Frame Bracket Thickness: .177\"
- Max Assembled Length, Bracket-to-Bracket: 23-3/4\"
- Shock mount hole size: 1/2”
- Shock mount max height adjustment above axle centerline: 4”
- Shock mount max height adjustment below axle centerline: 2”
- Height adjustment from axle centerline on upper mount holes: 5-25/32”
- Height adjustment from axle centerline on lower mount holes: 4-3/32”
- Axle tube diameter that brackets are notched for: 3”
Installation Tips
- If you plan street use for this universal 4-link kit, we recommend adding to the rod ends to prolong their life in such an environment.
- Be sure to use on all threaded connections to prevent galling of the threads and for easier adjustment of your suspension links.
- You will find both free and pay-to-use four-link suspension calculators online that will help you determine your four-link suspension’s optimum settings if you are unfamiliar with setting up an adjustable 4-link rear suspension.
Specs Material Type Steel Sold in Quantity Kit Finish Natural Upper Shock Mount 1/2 Inch Eyelet Lower Shock Mount 1/2 Inch Eyelet Hardware Included Yes Adjustable Yes Bushing Material Spherical bearing Control Arm Material Steel Rear Coil Springs Included No Panhard Bar Included No Torque Arm Included No Upper Trailing Arms Included Yes Lower Trailing Arms Included Yes Welding Required Yes Shocks Included No Adjustability 5-position Spring Type Not Included Suspension Height Adjustment Stock Height Trailing Arm Style Parallel 4-Link Suspension Kit Type Conversion Rear Suspension Type Solid Axle Bolt-On No Axle Housing Included No Frame Brackets Included Yes MFG. Part # 91649068 Third Member Included No Diagonal Link Included No Rod Ends Included Yes Shock Mounts Yes Wheelie Bar Mounts No Watts Link Included No Adjustable Panhard Bar Included No Control Arm Finish Natural Notes Requires welding and fabrication of frame mount brackets or crossmember Axle Tube Diameter 3.00 Rear Shocks/Struts Included No Reviews Yes I would buy this again Rated by Russell on August 31, 2021
Summary: Thick of the metal used
Yes, I recommend this product.
I would buy this product again Rated by AD on June 30, 2021
Summary: I installed it in my 1969 F100 outside the frame rails my friend installed his inside the frame rails on his 1963 Galaxy worked well on both
Pros: Easy to install with welding skills, Versatile f
Yes, I recommend this product.
very happy with purchase Rated by cayne on May 28, 2021
Summary: this kit was as it should be, fit the axle housing well and was easy to work with during install, I have not track tested yet but should be fine.
Yes, I recommend this product.
Nice set Rated by Quentrm250 on October 07, 2020
Summary: Works great if your building your own frame or back half. This kit simplified things a lot on my build. Time is money and at the price for the kit I couldn't build this for the time wasted.
Yes, I recommend this product.
Great fit and great price Rated by Spike on February 01, 2020
Summary: Easy to set up
Pros: Perfect
Yes, I recommend this product.
Related Items / Suggested Parts Speedway Universal Weld-On Rear Panhard Bar Track Rod Kit Plain Steel Bolt-On Rear Panhard Bar, For Ford 8 & 9 Inch Axle Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 72 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
