Roadmaster Rear Sway Bar Kit for RAM ProMaster 1500 / 2500 / 3500 (2019–2025) – #1129-155

Improve Stability. Reduce Sway. Transform the Way Your ProMaster Drives.

Whether your RAM ProMaster is an RV, work van, or adventure build, handling matters. If your van leans through corners, sways in crosswinds, or feels unstable when passing trucks, the Roadmaster Rear Sway Bar Kit (#1129-155) provides an immediate, dramatic upgrade in control and comfort.

Designed specifically for 2019–2025 RAM ProMaster 1500, 2500, and 3500, this heavy-duty rear anti-sway bar significantly reduces body roll and improves handling performance—especially when your van is loaded or driving on uneven roads.

Key Benefits

Instant Improvement in Ride Stability

• Reduces sway, body roll, and rear-end wander

• Enhances steering control on highways and curves

• Provides a more level, predictable ride over bumps and rough surfaces

Superior Construction & Materials

• Built from 4140 Chromoly Steel, far stronger than the 1020-grade spring steel used in many OEM sway bars

• Thicker diameter than stock, delivering up to 90% more resistance to sway

• Designed for long-term durability under heavy loads

High-Performance Bushings

• Equipped with polyurethane bushings that outperform factory rubber

• Resistant to heat, oil, gas, and ozone exposure

• Maintains stiffness and performance longer than rubber bushings

Durable, Weatherproof Finish

• Powder-coated for corrosion resistance

• Baked-on coating fuses to the metal for long-lasting protection

Why Upgrade Your ProMaster Suspension?

A stock ProMaster—especially when converted into an RV or loaded with equipment—tends to sway, lean, and wander. Roadmaster’s upgrade provides:
✔ More stable highway driving
✔ Safer handling during crosswinds
✔ Reduced body roll in turns
✔ Less driver fatigue on long trips
✔ Better control when towing or carrying gear

This is one of the most impactful upgrades you can make for ride quality and driving confidence.

Fitment

RAM ProMaster (Non-Dually)

• 2019–2025 ProMaster 1500

• 2019–2025 ProMaster 2500

• 2019–2025 ProMaster 3500

Part Number: 1129-155

Technical Highlights

• Material: 4140 Chromoly Steel

• Finish: Black powder coat

• Bushings: Polyurethane

• Rear sway bar upgrade (direct bolt-on)

What You’ll Notice After Installation

• More predictable handling during lane changes

• Reduced rocking and rolling when parking or hitting dips

• A vehicle that feels more like a stable, controlled van rather than a top-heavy RV

• A smoother, more enjoyable driving experience

Roadmaster Rear Sway Bar Kit for RAM ProMaster 2019–2025 | #1129-155 | Chromoly Steel | Polyurethane Bushings | Reduces Sway & Body Roll | Improves Handling & Stability | Ideal for RVs, Work Vans & Camper Builds