Product Code: 5570/5600

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

$809.95

Early Bronco 5.5 HD Leaf Spring × 2

$387.50

17 in stock (can be backordered)

Early Bronco Spring Eye Bushings

$34.95

22 in stock (can be backordered)

I understand that choosing the right springs for me is ultimately my responsibility. James Duff is not held responsible for the end result regardless of the information, coaching, and recommendations they offer.

Purchase this product now and earn 810 DuffBucks!

Looking for a high quality All American made leaf spring for your Early bronco that doesn’t break the bank? This progressive rate 11 leaf spring has been #1 for over 20 years now with superior strength, maximum articulation, and ride quality, and Duff’s is proud to offer it exclusively with the #1 suspension systems on the market.

Want coil springs to match? Purchase those here.

Are you wanting leaf springs for a different lift height? Check out our stock height, 2.5″ Lift or 3.5″ Lift leaf springs.

These premium springs come with standard features like Teflon wear pads, tapered ends, a built-in safety double wrap on the mainspring, and catch stops to prevent the spring from over articulating with your Monster or Duck Tuff suspension system. We even include black polyurethane spring eye bushings with sleeves, unlike other vendors where the bushings and sleeves are sold separately. If you need shackle bushings and sleeves as well, those are sold separately here.

You can also add on great upgrades when purchasing these springs like Leaf spring and shackle mounting hardware, Shackle bushings with sleeves, Duff HD spring plates, U bolts or HD U- bolts (both that come standard with new HD hardware), HD shackles, pinion shims, lift blocks or new Duff HD weld on spring perches offered in factory and 1″ built-in lift.

Now, before you choose your spring, you need to understand the difference between Medium duty and Heavy duty. First off the difference has nothing to do with ride quality. Our heavy-duty spring will not give your Bronco a stiffer ride. This is simply to make sure your Bronco will sit a little high in the back or level and not squat when your Bronco is complete and has a full tank of gas.

Medium-Duty springs are for 66-77 Broncos that have very few add-ons or accessories in the rear. For example, if you have a stock half cab or roadster you would choose medium duty. If you have a resto-mod wagon with a soft top, stock rear bumper, no spare tire, and stock fuel tank, with or without a back seat but not typically using it, then you also would choose medium duty springs. We do NOT recommend medium duty for trailer towing. Factory rear bumper & tire carrier with a factory to 31″ tire may sag a little depending on what other rear accessories you have. This is that middle ground we discuss further below. If you have a 33″ and bigger tire we do NOT recommend a medium duty spring even with a factory rear bumper. At this point you should consider upgrading to the EB HD stock bumper tire carrier offered HERE and using Heavy-Duty leaf springs.

Heavy-Duty springs are for 66-77 Broncos that are geared more towards a well-equipped resto-mod for on and off-road use. If you have or plan on upgrading to a 20+ gallon rear fuel tank, tire carrier + tire, steel plate rear bumper, and/or want to run a hardtop, the heavy-duty leaf spring is also a great choice for your build. If you like going off-road and hitting the trails, the heavy-duty leaf springs are typically what works best.  Heavy-Duty is the best option if you plan on towing anything with the Bronco.

For some of you, there will be some combination of parts that accessorize your Bronco in between a soft, medium, heavy, and extra heavy-duty setup. This is why we offer lifted spring perches, 1/2″ and 1″ lift blocks as well as pinion shims for driveshaft angle corrections to get your ride height and driveability spot on. Our new 1/2″ lift block available after 3-1-21 will also offer the option to move the axle back for that perfect amount of tire to fender clearance for the uncut lifted 66-77 Broncos.

Installation Note: The Double spring Wrap is to be installed towards the front of the Bronco.

Prop 65 Icon

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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