Leaf Springs & Suspension Authority Since 1965!

Heavy Duty Coil Springs for 71-93 D300/350 with 3800 & 4000 lbs front GAWR, 79-00 B300/350, 78 B300 with 8200 & 9000 lbs GVW, 79-81 CB300/400 & MB300/400 - 2225 rate per coil

(1 review)
Current Stock:

Sold as a pair.

Super Duty Coil Springs are custom designed to give you 1000 pounds of additional load handling capability per pair with a maximum of 1/2 inch increase in ride height at zero additional load.  Coated with an attractive silver-gray baked on epoxy finish.  Super Duty Coil Springs are the only practical helper spring alternative when shock absorbers are mounted inside the coil spring and are an excellent choice for vehicles equipped with diesel engines or snow plows.  Super Duty Coil Springs also require no maintenance making them an excellent load handling solution for fleet vehicles, pickups, vans and motorhomes.  Super Duty Coil Springs improve the handling and ride quality of heavily loaded vehicles, thereby reducing driver fatigue and increasing safety and efficiency.


  • 5
    Hard to find co...

    Posted by The V on Aug 23rd 2016

    Hard to find coils for my old RV were right here. Great description so I knew that they were not just "heavy duty" but rated the load capacity that I required for the larger engine and chassis. No more bouncing front end!