Leaf Spring Enhancement Kit -RoadActive Suspension – Heavy Duty for Ram ProMaster Vans

Description

RoadActive Suspension Leaf Spring Enhancement Kit – Ram Promaster

Upgrade your Promaster’s rear suspension for the road ahead.
The RoadActive Suspension (RAS) Leaf Spring Enhancement Kit is a bolt-on, maintenance-free system that dramatically improves your Promaster’s handling, stability, and load-carrying capacity. Whether you’re hauling gear, towing a trailer, or just dealing with heavy builds, RAS enhances your van’s ride performance without sacrificing comfort.

This kit works by applying constant tension to the leaf springs, reducing sway, improving cornering, and minimizing rear-end sag under load. It installs directly onto your factory leaf springs—no drilling, cutting, or welding required—and includes everything needed for a seamless fit, including Promaster-specific components for parking brake clamp and shackle access.

🔧 Key Features:

• ✅ No-Drill Installation – Fully bolt-on with basic tools

• 🚐 Promaster-Specific Fit – Supports 2014–2025 models (1500, 2500, 3500, etc.)

• ⚖️ Improved Load Support – Boosts spring strength up to 40%

• 🚫 Reduces Sway & Sag – Enhances cornering and stability under heavy loads

• 🔄 Adjustable Tension – Fine-tune with included white/black tension discs

• 🛠️ DIY-Friendly – Clear step-by-step instructions and video support

• 🧰 All Hardware Included – Brackets, spacers, threaded rods, and anti-seize packet

🧱 Kit Includes:

• Leaf Spring Enhancement Assemblies (pair)

• Eye brackets, axle brackets, threaded rods

• Extension brackets (pre-installed)

• Tension spacers (white and black)

• Complete install hardware and instructions

💡 Fitment Details:

• Fits Ram Promaster 2014–2025+

• Compatible with RAS Part Numbers: 3621, 3621HD, 3621T, 3621THD, 3622, 4621, 4622

• Designed for stock rear leaf spring setups

click for installation instructions

Additional information