This system is offered in Duff Signature Blue or Midnight Black.

For this system, it is offered in two variations, Ultimate or Ultimate Plus.

The ultimate system includes 8 70/30 shocks and the correct hardware to install the shocks to the factory radius arms.

Ultimate Plus - allows you to upgrade your shocks to 4 MS2020 shocks and our T-Rex Radius arms.

For the track bar, you can choose between our hassle-free track bar to allow for infinite adjustability and durability or you can opt for our standard adjustable track bar with polyurethane bushings.

The simple fact is, if you lift your Early Bronco's suspension over 3", the 7-degree C bushings won't give you enough caster correction all on their own. You will need to add more caster to the front end or the Bronco will not be enjoyable to drive.

If you are not installing our T-Rex arms and you are using your Bronco mostly for street driving and you want to be able to dial in the caster even further then we suggest installing our radius arm drop brackets. These will allow for more caster correction for the stock radius arms.

If you already have a drop pitman arm you can move on and not purchase our drop pitman arm. If you do not plan on changing out your stock steering and do not have a drop pitman arm, you will want to purchase the drop pitman arm now.

If you want to upgrade your steering system, we suggest checking out this blog post for more information. You may also want to consider our dual sport heim steering system located here. Keep in mind, we will also be asking you if you want a drop pitman arm if you purchase our steering so be careful not to purchase a drop pitman arm twice. To avoid this and consider a more comprehensive performance package for your Bronco, check out Silver's Performance Package.

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 level or at the very least not squat in the back when your Bronco is complete.

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.

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. These are also the best option if you plan on ever towing anything with the Bronco. If you like going off-road and hitting the trails, the heavy-duty leaf springs are typically the best option for you as well.

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 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 aka Military wrap is to be installed towards the front of the vehicle.

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

We highly recommend purchasing and installing pinion shims at the time of installing your leaf springs. If you do not know how to measure your pinion angle please refer to our driveshaft measurement form here. If you are installing this system on your Early Bronco and it's equipped with a stock style frame, stock drivetrain configuration, and stock rear axle then you can start with a 6-degree pinion shim if you do not want to measure the pinion angle after the lift is installed. If you find that you need more than 6 degrees of pinion correction then you'll need to cut off the leaf spring perches and install ours. We have preselected 6-degree pinion shims for your order. If you would like to select a different degree or purchase our weld-on spring perches please scroll down and the other options will appear.

With any lift, we highly suggest upgrading your frame to axle lines at the same time.