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5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

Discover the perfect upgrade for your 1966-77 Early Bronco with our 5.5″ Heavy Duty 11 Leaf Springs. Engineered for exceptional strength and ride quality, these springs are designed for maximum articulation, making them the top choice for over 20 years.

$809.95

Product Description

Crafted in the USA, our 11 leaf springs offer a progressive rate that provides outstanding performance without breaking the bank. These premium springs come with essential features such as Teflon wear pads, tapered ends, and built-in safety double wraps on the mainspring. Additionally, catch stops prevent over-articulation when used with your Monster or Duck Tuff suspension system.

Included with your purchase are black polyurethane spring eye bushings and sleeves, enhancing durability and reducing wear, all at no extra cost. If shackle bushings and sleeves are needed, they are available separately.

For those looking to enhance their suspension further, optional upgrades include:

– Leaf spring and shackle mounting hardware
– Shackle bushings with sleeves
– Duff HD spring plates
– U bolts or HD U-bolts
– HD shackles
– Pinion shims
– Lift blocks
– Weld-on spring perches available in factory and 1″ built-in lift options

Understanding whether to choose medium or heavy-duty springs is crucial. The heavy-duty version ensures your Bronco sits level or slightly higher in the rear, accommodating additional weight without sacrificing ride quality.

Medium-duty springs are suited for Broncos with minimal rear accessories, while heavy-duty springs are ideal for well-equipped builds that may include larger fuel tanks or frequent off-road usage. For any towing requirements, the heavy-duty option is strongly recommended.

To achieve optimal ride height and driveability, we offer a variety of solutions, including lifted spring perches and lift blocks. Our new 1/2″ lift block allows for adjustments that enhance clearance for uncut lifted Broncos.

Installation requires that the double spring wrap be oriented towards the front of the Bronco for optimal performance.

Features & Benefits:

Made in the USA
Progressive rate design
Exceptional strength and maximum articulation
Teflon wear pads
Tapered ends for improved performance
Built-in safety double wrap on mainspring
Catch stops to prevent over-articulation
Includes black polyurethane spring eye bushings and sleeves

Technical Specs:

Product type: Leaf Springs
Size: 5.5 inches
Leaf count: 11
Fit: 1966-77 Early Bronco
Recommended use: On-road and off-road applications

Additional Information

Additional information

Weight	146 lbs
Dimensions	55 × 12 × 12 in
Choose Type	Medium Duty, Heavy Duty

Early Bronco 5.5 Hd Leaf Spring

Weight	60 lbs
Dimensions	60 × 6 × 6 in

Early Bronco Spring Eye Bushings

Weight	1 lbs
Dimensions	4 × 2 × 2 in

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Trusted Since 1967

Nearly six decades of craftsmanship and innovation have made James Duff Inc. a leading name in Bronco performance.

Quality You Can Count On

Every component is designed, tested, and built for long-lasting durability—on the road and off.

Expert Support

Have questions? Our experienced team is here to help you choose the right parts for your Bronco.

James Duff Inc. specializes in precision-engineered suspension, steering, exhaust and off-road components built exclusively for 1966–1996 Ford Broncos.

We are currently experiencing issues with our stock levels syncing from our inventory system. Items may show out of stock when they are not.
Please call or text to verify +1 865-938-6696.

5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

Early Bronco 5.5 Hd Leaf Spring × 2

Early Bronco Spring Eye Bushings

Welcome to DuffTuff.com

5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

5.5″ 11 Leaf Springs, Heavy Duty, 1966-77 Early Bronco, Pair

Early Bronco 5.5 Hd Leaf Spring × 2

Early Bronco Spring Eye Bushings

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