Extreme Duty Leaf Springs U-Bolt Kit, 66-77 Ford Bronco SKU: 1195

Early Bronco Extreme Duty Rear Leaf Spring U-Bolts & Retainer Plates

When your Bronco hits the trail, the last thing you want is a weak link holding back your suspension. That’s why we developed the Extreme Duty Rear Leaf Spring U-Bolts & Retainer Plates—designed to withstand the brutal forces of heavy trail use, rock crawling, and hardcore wheeling.

Factory U-bolt plates just weren’t cutting it. We saw them bend under pressure and decided to go all in—upgrading the U-bolts to beefy 5/8" steel and building retainer plates from massive 5/8"-thick zinc-plated steel. Most aftermarket plates are only 3/8" thick, but we weren’t about to settle for “good enough.”

We didn’t just go thicker—we engineered smarter. Instead of harsh, sharp-cut edges that can stress the spring and cause fatigue or breakage, our plates feature routered, rounded edges that reduce stress and move with the spring’s articulation. These are the kind of upgrades that make the difference between finishing a trail ride or getting towed out.

• Extreme Duty Plates: Made from 5/8" thick zinc-plated steel—stronger than most 3/8" aftermarket versions

• Heavy-Duty U-Bolts: Upgraded from stock 1/2" to 5/8" diameter for serious clamping force

• Superior Fit: U-bolts measure 5/8" x 3-1/4" x 8-3/4", perfect for lifted or off-road setups

• Stress-Free Design: Custom routered plate edges prevent stress risers and spring damage under articulation

• Corrosion Resistance: Both plates and U-bolts are zinc-plated for long-lasting durability and rust protection

• Trail-Tested & Proven: Designed and tested by real-world off-roaders who demand performance and strength

• Direct Replacement: Fits Early Bronco rear leaf spring setups with no modification needed

Trail-tested and intentionally overbuilt - these 5/8" Extreme Duty U-bolts and plates keep your Bronco’s rear axle clamped solid no matter how hard you wheel.