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Sonoran Steel Fabrication LLC

2010 - 2023 Toyota 4Runner Trail/TRD Off Road KDSS Complete Suspension System - Radflo/Sonoran/Camburg

2010 - 2023 Toyota 4Runner Trail/TRD Off Road KDSS Complete Suspension System - Radflo/Sonoran/Camburg

Regular price $4,399.00 USD
Regular price Sale price $4,399.00 USD
Sale Sold out

Radflo 2.5 Front Reservoir Coil Overs and 2.5 Rear Reservoir KDSS Specific Shocks

(2) Radflow 2.5 Front Coil Overs: Remote Reservoir and spanner wrench
(2) Camburg Performance X-Joint Upper Control Arms
(2) Radflow 2.5 Rear Custom Shocks: Remote Resivoir KDSS Specific Shocks
(2)-Radflow Custom Wound 2" Lift Rear Coils
(1)-Sonoran Steel Built Adjustable KDSS Trac/PanHard/Lateral Bar

* Front Coil Overs can be ordered with the following coils: 600, 650 or 700.  These numbers are how much weight it takes to compress the coil 1 inch.  600 is typically for a stock truck and 650 a truck with a winch and bumper. 

* Front Coil Overs Available in Standard or Extended.  Extended requires an aftermarket UCA.  We include the Camburg Ball Joint Arms, so Extended will automatically be ordered for you.

 In 2012 we bought a brand New Trail 4Runner with KDSS. While the bulk of or work at that time was with 3rd gen 4Runners (1996-2002), I knew this was one heck of a truck and spent years dreaming up parts to make it better. After installing our current offering and other manufactures suspension offering for these trucks, there was one thing that I felt everyone dropped the ball on.

The Trac/PanHard bar for the KDSS trucks. We all know that the Jeep Wrangler and the American full size pickups with straight front axles had Trac/PanHard bends in them to dodge around things for many years. These bars are all sand cast and difficult to manufacture on small scale, which the KDSS market it.

After working on this for literally years we found a solution. The original prototype was fabricated out of cut tube and zigzagged all over the place. It was incredibly time consuming to make and frankly looked ugly. But at that point we had a pattern that cleared everything. Full stuff with coils and shocks removed and full drop with shock removed. We now knew exactly how far the KDSS bar would let the suspension move, uninhibited bay the trac bar.

So finally how do we actually make this thing? Waterjet is how. Starting with a 3 foot by 3.5" of Cold Rolled Solid Steel Bar, the Waterjet carves this bar out of solid 1" thick cold rolled steel! The entire bar is a consistent 1" x 1" solid cold rolled steel. It is heavy. On the 4th gen 4Runner, Toyota used 1" round solid hot rolled round stock. So this is not a new idea with the size and material used in this application. The ends are custom polyurethane bushings made for us by Daystar in Phoenix. They have grease grooves and we have made several improvements to the mold over the last 8 years (2010-2018) as we have always made a straight tube Trac/PanHard bar for the 4th/5th Gen 4Runners and the FJC. The adjustable end is a huge 7/8"-16 grade 8 threaded rod into a tube adapter made by Ballistic Fab in Tucson, hollow end of the bar is 1.5" x 1.5" x .120 wall Cold Rolled Square Tube, finally the same bushing setup as the other end. Finally the part is painted with STEEL-IT® super corrosion resistant paint.

The rear shocks are custom made by Radlo just for us and are designed to retain the stock compressed length/upward travel. So no up travel is lost. What they have done is add additional droop to allow the hydraulic plunger to drop an additional 1" downward. This leaves an additional 3/8" plunger travel still, so no damage will occur to the unit. These shocks WILL NOT pull your plunger out too far. They utilize the maximum up travel provided by Toyota and the extra down travel provided by our custom Trac/PanHard bar for the ultimate KDSS articulation. You MUST use stock Toyota upper and lower rear links or aftermarket upper and lower rear links that are set to the same length as the stock Toyota rear links for this product to work correctly. It does not matter if they are stock or aftermarket, it only matters that the length of the links is the same as stock.

Custom Radflo KDSS extended travel reservoir shocks.


California Residents:  Radflo products ship directly from Radflo which is based in California.  According to California Law: Sales and Use Tax Regulations, ARTICLE 18. ADMINISTRATION—MISCELLANEOUS, REGULATION 1706, DROP SHIPMENTS.  If you have the Radflo products shipped to an address in California, you will be contacted AFTER the sale with the amount of sales tax you owe the State of California.  This sales tax will ONLY be collected on Radflo products and not on Sonoran Steel Products which originate from the State of Arizona.


Today's marketplace offers more choices than ever before. New brands are constantly emerging, while established names attempt to recapture your attention. With so many choices available, you may be wondering what advantages Radflo has to offer. Actually, we're glad you asked!


From the materials used to produce each individual component, to the final assembly procedure, Radflo employs the highest quality standards at all times. For larger manufacturers and high volume products, the temptation to save money on materials and production is often impossible to resist. When you choose Radflo products, you can rest easy because we always place quality before profitability. No exceptions!



Simply put, Radflo customers get more for their money. Just because we don't charge as much as our competition, don't believe for a moment that we deliver less. In fact, we believe you will find our products to be comparable – if not superior – to those available from the most respected names in the industry.



As a supplier to the OEM, aftermarket suspension manufacturers, and some of the most successful racing teams in the world, we have the knowledge, experience and resources to make your suspension perform better than you ever thought possible. Radflo customers around the world have used our shocks to achieve success in virtually every type of application you can imagine. Motorcycles, drag racers, street rods, trophy trucks, even open wheel race cars... if it has a suspension, we have the solution.



Call us old fashioned, but we believe superior customer service is still the cornerstone of any great company. While other manufacturers rely on virtual customer service representatives and automated call handling systems, Radflo does not. When you call us, you'll always be greeted by one of our friendly, knowledgeable representatives who are eager to assist.



Our highly qualified technical support staff is ready to help you with any service related issues that you may require. They take great pride in responding to your needs with efficiency and diligence. Even when your warranty has expired, you can still count on our support team to provide a fair resolution to any technical matters that may arise.


Front Radflo 2.5 with External Reservoir and Optional Valving Adjuster Shown.  Camburg Ball Joint UCA's Shown (Available from other vendors) 2015 TRD Pro 4Runner.

Rear Radflo 2.5  with External Reservoir and Optional Valving Adjuster Shown.  2015 TRD Pro 4Runner.

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