TRIANGLE SUSPENSION 43-377HD Ford - Truck, R Spr, Lvs:12/3, Heavy Duty; OEM# ; SE Length: 29-3/4; LE Length: 29-3/4; SE End: HK-3; LE End: HK-3; Grading 12/4993RR/447

Since 1919, Triangle Suspension Systems Co.® has set the gold standard for steel leaf springs. With generations of spring shop customers going back for more than 7 decades, Triangle Suspension has made a name for itself for its use of high-quality materials that are backed by ISO-compliant manufacturing processes. Their catalog covers a wide range of applications, including leaf spring assemblies, air beams, and helper springs for light, medium, and heavy duty vehicles. They also offer spring repair components and custom-engineered spring to fill almost any niche. All their products are manufactured in-house in their DuBois, PA, manufacturing facility and distributed across the United States and beyond.