Promaster SuperSprings Steel Helper Spring

$ 597.99

SuperSprings rear steel helper springs for Promaster vans and cab chassis, 1500, 2500, and 3500. These are designed to enhance load carrying capacity, handling, and towing. Rated at 1900 lbs of additional load leveling ability. Great for Promaster based RV's and commercial vans.

This is a steel helper spring and a progressive system which will increases load holding as you compress it. The patented roller system on the spring ends allow for good flex. As the factory springs flatten under load the helper spring ends are able to slide or roll to their new location rather than dragging or causing friction. This helps eliminate binding that causes poor flex and limits travel of the suspension, which can result in a hard or harsh ride. That is why many traditional add a leafs, helper springs or assist springs have a bad reputation for creating a brick hard ride. The roller system also allows tension between the factory springs and the Supersprings, this keeps the product from rattling.

You can mount this system to gain some lift in the rear as well, if extra ground clearance is desired. Smooth, quiet, and strong. All steel helpers springs will firm an unloaded vehicle to some extent. For loaded vehicles you may see increased ride comfort and a more level vehicle. 


  • Comes with all hardware necessary for installation - sold in pairs.
  • Never Exceed Gross Vehicle Weight Rating
  • Read all manufacturers recommendations and warnings
  • All warranties are manufacturers' warranties


Clear instructions are included, and full tech support is always offered. Call anytime with questions or orders 971-678-5940.