Product Code: 5350-Config

Extended Long Travel Radius Arms 1966-77 Bronco Configuration

From: $1,159.05

(3 customer reviews)

Frequently Asked Questions
Before Purchasing:

Factory sway bars must be removed to use our Extended Travel Radius Arms. If you'd like to upgrade check out the Hellwig Swaybars. They are compatible provided your shock is mounted to the rear of the coil bucket. Is your Early Bronco equipped or are you looking to buy long tube headers? Please keep in mind we redesigned our long tube headers to work with our extended radius arms. Check out our Black Painted or Ceramic Coated headers here. If you are running another manufacturers' long tube headers we cannot guarantee fitment. If you are running factory manifolds or shorty headers there will be no fitment issues.

Contents

Includes:

Please note these are heavy-duty, they come in two packages totaling 121lbs! 

Includes:

  • 1 Driver and 1 Passenger Side Radius Arm
  • 2 Headunits
  • 1 Driver and 1 Passenger Side Frame Bracket
  • Hardware Kit
  • Anti-seize
  • Instruction Sheet

Add-Ons to Consider:

    • C-Bushings
    • High Pinion Dana 44 Spacer and Bolt Set
    • Dana 60 Spacer and Bolt Set
    • Heavy Duty Lower Coil Spring Retainers
    • C-Caps

Information

Please note: Due to the huge popularity of this item, there is currently a delayed shipment time of 8 weeks on these parts. You will be emailed with an estimated ship date after your order is placed. 

New & Improved design for 2020! Now featuring a dual shear shock mount that pairs perfectly with our brand new MS2020 shocks. More strength - More stability that works with single or dual shock setups.

Looking to improve the ride of your Ford Bronco? Are you wanting it to handle better and get your turning radius back? Need better traction for when you go off-road? Then check out our proven Long Travel Extended Radius Arm. Designed for rugged off-road use while enhancing drivability.

Fabricated out of 2" diameter, heavy-wall DOM at a whopping 5/16" thick! For strength and safety, we designed a separate cast steel head unit to mount to the C-wedges on the axle with your original C-cap or our new ones sold separately. These arms are 10 3/4" longer than a '66-'79 Bronco arm, moving the pivot point farther back. This vastly improves suspension travel & articulation but it doesn't stop there. These arms also improve handling & control for on-road & off-road driving while giving you back the tight turning radius you lost when you added larger tires.

Fabricated from all new materials; no core charges, no cutting or welding to 50-year-old cast arms. Built-in caster means better alignment and handling. A tight to the frame rear mount holds the arm with a high quality 1" bore Teflon lined and lubricated Rod End. Keeping the arm closer to the frame for improved ground clearance and break-over angle. Tons of travel, a tighter turning radius, better ground clearance and improved handling all in one product!

Includes arms, head units, rod ends, frame mounts, bushings, and all necessary mounting hardware. Bolt-on installation, but some welding is recommended. Requires at least a 2.5" suspension lift. We recommend 3.5"+ for hardcore use. C-bushings are sold separately due to vehicle variations and lift height. Built-in dual sheer shock mount for use with our new MS2020 shocks (1 per arm) or our classic 70/30 shocks that can be installed using 1 or 2 per arm. Arms pair nicely with our hoops (standard or long travel) or our towers.

Best results are achieved when these arms are used in conjunction with Duff suspension components. Requires reuse of original C-caps (sold new separately) #5341.

Please note these are heavy duty. Even though they ship ground, they come in two boxes totaling 111lbs!

Features

Features:

  • Proven Design since 2001 - Updated for 2020
  • 10 3/4" longer than stock
  • Built-in 4.25 Degrees of added caster
  • Backed by the best customer service in the industry
  • Buy these arms and combine them with Duff Springs, Mounts & Shocks for the nicest riding Bronco.
  • Big Tires? Due to the offset built into them, that's what these arms are made for
  • Needing more articulation, more flex? Our extended arms will give you the most of any arm on the market
  • Strongest extended radius arms available
  • Made from 100% brand new American Materials
  • Comes powder coated with all necessary hardware
  • Just say no to janky designs and core charges!

FAQ

Frequently Asked Questions: 

Q: Do these arms work with long tube headers? 

A: The James Duff Long arms provided in this kit will only work with James Duff Long Tube headers produced after 2002. If you have any other long tube headers other than these BE ADVISED that you may have a clearance issue​ with the arm​.

Q: What is a radius arm and why should I upgrade to the James Duff Long Arm?
A: James Duff Inc. has been the leader in Bronco off-road suspension for over 20 years. Why you ask? Our Extended Long Travel radius arm matched with our long-travel suspension systems allow the Bronco to traverse over almost any terrain. Designed and manufactured by James Duff Inc. It is a tubular & plate steel design that utilizes a secondary cast steel component called a head unit to mount it to the Bronco. This two-piece design not only makes the install easier but also incorporates 4.25 degrees of added caster. When it comes to lifting Bronco front suspension, CASTER IS KING! This extended length radius arm is not only MASSIVELY stronger and offers MORE caster than the OEM design but it also allows up to 37" tires to fit w/o sacrificing the Broncos tight turning radius. This arm is a direct fit for all dana 30 & 44 axles made from '66-'79. 

Q: What axles are these arms compatible with?
A:
Our radius arms are designed and engineered to work the factory-equipped Dana 30 or Dana 44 front axle on the Early Bronco Platform. They will also work in the Full-Width High Pinion Dana 44 that comes installed in the '76-'79 F-150 4x4 or '78-'79 Big Bronco. If you are wanting to pair them with another axle such as a Dana 60 or Super-Duty 60 then you must ensure that the axle uses the ford style axle wedges or you must grind off any brackets that use a different style attachment point and weld on the wedges we sell. 

Q: I ordered these but they are missing the part to bolt on the head unit to the axle! 
A: Correct this kit doesn't include new c-caps. You must select that option at check out or reuse your factory-equipped C-Cap. Keep in mind we offer the optional c-cap add-on in color-matched powder coat or bare if your C-Caps are in rough shape. 

Compatibility

Ford Early Bronco

  • 1966
  • 1967
  • 1967
  • 1968
  • 1969
  • 1970
  • 1971
  • 1972
  • 1973
  • 1974
  • 1975
  • 1976
  • 1977

 

Instructions

Want to know what's involved for installation?  Click here for instructions.

Made in the USA

Prop 65 Icon

Weight 115 lbs
Dimensions 48 × 16 × 16 in
Choose Color

Duff Signature Blue, Midnight Black

3 reviews for Extended Long Travel Radius Arms 1966-77 Bronco Configuration

  1. Rober Williamson (verified owner)

    Great product!

  2. linsey melancon

    I was very satisfied with the construction and all required hardware present, Installed complete over the Knuckle Heim Kit with raised Trackbar bracket, & tapered studs, along with Duff long arms, eliminated all bump steer on my 1975 with 5.5″ JB lift and 35″ MasterCraft MTs, drives straight as an arrow at 80 mph on Louisiana roads. Money well spent.

  3. Doug Hudson (verified owner)

    Great quality, awesome fit and finish

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