Product Code: Early Bronco Coil Springs

Progressive Rate Coil Springs, 1966-77 Bronco, Pair

$199.95$234.95

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.

Earn up to 235 DuffBucks.

(16 customer reviews)

We’ve taken our decades of experience in Early Bronco suspensions and produced our progressive rate coil springs to be the best available, period! Several independent tests by Bronco owners have shown our springs provide the highest degree of ride quality on the market when matched with our suspension systems.

We realize that every Bronco owner uses their vehicle in a different way. We addressed this by creating a dual-stage progressive rate spring that provides excellent on and off-road ride and handling, as well as jaw-dropping suspension travel that lasts. Having a spring that lasts is extremely important since most people don’t want to be buying springs every couple of years.

Our progressive coil rate increases as the coil compresses. The upper wraps are softer for a more comfortable street ride; the lower rates are firmer to handle bumps and dips without jarring and bottoming out. The progressive nature of the spring also allows for better and more predictable handling by helping keep the vehicle flatter in the corners and limiting body lean.

Our Broncos are our daily drivers and our play vehicles. We’ve been there and done that, so you can rest assured that no matter what you want to do with your vehicle, our suspension will take you there and back in comfort. All coils are blue or black powder-coated for durability.

Looking for springs for your new James Duff 4 link setup? Our stock replacement coil springs #5103 are the springs we use in our 4-Link kits.

Check out our Upper Coil Retainer Tabs too while you are at it! #5100

Weight 34 lbs
Dimensions 21 × 10 × 5 in
Choose Color

Duff Signature Blue, Black

Choose Lift Height

Stock Replacement / Duff 4 Link, 1.5" Lift Coil Springs, 2.5" Lift Coil Springs, 3.5" Lift Coil Springs, 5.5" Lift Coil Springs

16 reviews for Progressive Rate Coil Springs, 1966-77 Bronco, Pair

  1. Eric T (verified owner)

    I last replaced my front coils with Duff springs some 37 years ago on my 70 Bronco. And I bet I would not have needed to replace them if not for a higher desired lift. So I knew there was only one brand I wanted to buy. I think progressive is the way to go (rather than linear) and these were consistent such that they fit just the same on both left and right. Great lift and ride.

  2. tony-6356 (verified owner)

    The springs gave my front end a whole new look and a better feel on & off the road!
    Big time upgrade!

  3. Johnathan McCall (verified owner)

    Took off some other brand 5.5” springs and put on 3.5” Duffs Springs. Love the ride these give. Not been off-road with them but on the road it’s a good smooth ride and handles great.

  4. Bill (verified owner)

    Purchased 3 1/2” front springs. Excellent quality, excellent ride improvement over the 90’s lift that was on the truck. Highly recommend.

  5. Ron (verified owner)

    much smoother ride than my old Rancho Lift

  6. Jacob Waring (verified owner)

    I just recently bought the 5.5 inch for my SAS Tahoe. They fit perfectly and the ride height is just how I wanted it. There is a ton of flex and the ride quality is superb even without a front sway bar. Would recommend to anyone planning to SAS using a 66-77 bronco front end.

  7. Jerry Richards (verified owner)

    Ordered online got them a couple of days later. Bronco rides alot better now

  8. Corbin

    Flex real well, fit well with doing a bronco 44 sas swap on my truck.

  9. Kevin Smith

  10. Sean Bell

    Quick and easy order and a top rate product! The Bronco rides like a different truck now!

  11. Richard Snyder

    4 Link Springs! great communication through the whole process. Great Product as always.

  12. Austin Cory

    I’m doing a budget build and these springs are perfect. Most affordable progressive rate springs I could find.

  13. Shawn Malcom

    As always great price best customer service and quality parts

  14. James Noles

    Thank you for supplying the best parts available to make my 74 Bronco Duff Tuff! It’s the only place I shop for all my bronco needs and wants!

  15. Mark Vogel

    Great Experience with these guys

  16. Todd Zuercher

    I received my 2.5″ progressive coil springs yesterday – quick shipping after placing the order online. Tonight I calculated the spring rate on them and I think they’re just about what I’m looking for. It’ll be awhile until I get them installed but I’m looking forward to giving them a workout.

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