KONI 8205-1006 Special Active FSD Rear Shock Absorber 2014-2024 Ram ProMaster 1500 / 2500 / 3500 (Leaf Spring) 469mm

The KONI 8205-1006 Special Active rear shock absorber is the direct OEM-length replacement for 2014–2024 Ram ProMaster 1500, 2500, and 3500 vans equipped with rear leaf springs. Part number 8205-1006 features KONI's Frequency Selective Damping (FSD) technology a fully passive, self-adjusting hydraulic system that automatically reads road conditions and adapts damping force in real time, with zero electronics and zero driver input required. Extended length (LMAX) is 469mm; compressed length (LMIN) is 307mm, exactly matching OEM dimensions for a straight bolt-on installation.

What Is KONI Special Active (FSD) Technology?

KONI Special Active also marketed as FSD (Frequency Selective Damping) by many North American retailers uses an internal hydraulic bypass valve that responds to the frequency and amplitude of suspension inputs rather than simply reacting to velocity alone. The result is a shock that firms up during high-amplitude, low-frequency events like cornering and lane changes (improving stability and road holding) while simultaneously softening over high-frequency, low-amplitude inputs like expansion joints, rough pavement, and highway chatter (improving ride comfort and filtering out vibration before it reaches the cabin). One shock does the job of a sport tuned unit and a comfort tuned unit simultaneously no compromise. This technology has been proven on over 10 million factory-equipped vehicles worldwide.

Why 8205-1006 for the Ram ProMaster?

The Ram ProMaster 1500, 2500, and 3500 share the Fiat Ducato J4 platform, a commercial van architecture designed around a multi-payload, multi-use operating profile. Stock dampers are tuned to a generic mid-point that neither handles dynamically nor rides comfortably under varying load conditions. KONI 8205-1006 replaces the rear shock on all three ProMaster payload classes Base trim, all engine configurations and automatically adjusts to whether the van is running empty or loaded, driving highway or city, straight or cornering. No manual rebound adjustment is needed or available; the shock manages itself.

KONI 8205-1006 is sold individually (one shock per purchase). A full rear axle replacement requires two units. For a complete front-to-rear upgrade, pair with KONI 8705-1332 Special Active front struts (sold separately, qty 2 required).

Fitment — 2014–2024 Ram ProMaster (Leaf Spring Equipped)

Important: 8205-1006 fits the Ram ProMaster 1500, 2500, and 3500 only. It does not fit the Ram ProMaster City (different platform, different wheelbase, different rear suspension geometry). Verify your van is a full-size ProMaster before ordering.

Platform Note — Fiat Ducato / Stellantis J4

The Ram ProMaster is built on the Fiat Ducato J4 platform, which has been in production since 07/2006 in Europe as the Fiat Ducato 250/290, Citroën Jumper/Relay, and Peugeot Boxer. KONI 8205-1006 fits all of these platform siblings. If you are in North America driving a ProMaster, you have the 2014+ version of this platform. European platform fitment (2006+) is noted here for reference.

Technical Specifications

Key Features

• Frequency Selective Damping (FSD): The internal bypass valve reads suspension input frequency and adjusts damping automatically no electronics, no sensors, no driver input.
• Dual-mode performance in one shock: Firms up for cornering stability and load control; softens over rough pavement and highway seams for vibration isolation.
• Proven on 10+ million factory-equipped vehicles worldwide as original equipment.
• Direct OEM replacement: 469mm extended / 307mm compressed matches factory dimensions exactly bolt-on installation, no modifications required.
• Non-handed: One part number (8205-1006) fits both the left rear and right rear position.
• No electronics or external adjusters: The passive hydraulic design requires zero maintenance and has no components to fail electronically.
• Compatible with all three ProMaster payload classes: ProMaster 1500, 2500, and 3500.

Companion Parts — Complete ProMaster Suspension Upgrade

KONI 8205-1006 covers the rear axle only. For a complete front-to-rear Special Active upgrade on the 2014–2024 Ram ProMaster 1500/2500/3500, pair with:

• KONI 8705-1332 — Special Active Front Strut, 2014+ Ram ProMaster 1500/2500/3500 (sold separately, qty 2 required for a complete front axle)

Full kit: 2× KONI 8705-1332 (front) + 2× KONI 8205-1006 (rear) = complete four-corner Special Active suspension for the Ram ProMaster.

Installation

KONI 8205-1006 is a direct bolt-on replacement using factory mounting hardware. No cutting, welding, or modification is required. Top eye / bottom eye mounting matches the OEM shock configuration on leaf spring-equipped ProMasters. KONI's official installation instructions are available for download directly from KONI North America. As with any suspension component replacement, a post-installation alignment check is recommended.

Frequently Asked Questions

Does KONI 8205-1006 fit the Ram ProMaster City?
No. The ProMaster City is a smaller, unibody van on a completely different platform with different rear suspension geometry. KONI 8205-1006 is engineered specifically for the full-size Ram ProMaster 1500, 2500, and 3500 with rear leaf springs. Do not order this part for a ProMaster City.

Is 8205-1006 for the front or rear?
8205-1006 is the rear shock absorber. It fits the rear axle on all three ProMaster payload classes (1500/2500/3500). The companion front strut for the Ram ProMaster is KONI part number 8705-1332.

Does one listing cover both left and right rear?
Yes. KONI 8205-1006 is non-handed a single part number fits both the driver-side and passenger-side rear positions. Each purchase is for one (1) shock. You will need to purchase two (2) units to replace both rear shocks.

What is the difference between KONI Special Active and KONI FSD?
They are the same product. KONI rebranded the series from "FSD" (Frequency Selective Damping) to "Special Active," but the part number 8205-1006 is unchanged. Many North American retailers including Brazel's RV, SuperSteer, and Ultra RV Products still list this as "FSD." If you see either name with the same part number, they are the same shock.

How does Frequency Selective Damping work?
FSD uses an internal hydraulic bypass valve that responds to the frequency of suspension movement rather than velocity alone. High-amplitude, low-frequency inputs (cornering, braking, load shifts) receive firmer damping for stability. Low-amplitude, high-frequency inputs (road texture, expansion joints, vibration) receive softer damping to filter noise and harshness from the cabin. The adjustment is instantaneous, continuous, and passive — no electronics are involved.

Will KONI 8205-1006 fit a loaded ProMaster or cargo van build?
Yes. The Special Active technology is specifically well-suited to commercial vans with variable load conditions. The shock automatically adjusts its damping profile to account for changes in payload, so the van behaves predictably whether you are running empty or fully loaded.

What are the exact dimensions of KONI 8205-1006?
Extended length (LMAX): 469mm. Compressed length (LMIN): 307mm. Stroke: approximately 162mm. These dimensions match factory OEM length specifications for the 2014–2024 Ram ProMaster rear shock position.

Does installing KONI 8205-1006 void my ProMaster's factory warranty?
No. Under the Magnuson-Moss Warranty Act, a vehicle manufacturer cannot void your factory warranty simply because you replaced a wear item like a shock absorber with a branded aftermarket part. KONI 8205-1006 is a direct OEM-specification replacement that does not require any permanent modification to the vehicle.

What warranty does KONI offer on 8205-1006?
KONI covers 8205-1006 with a 2-year manufacturer's warranty. Full warranty terms and conditions are available at koni-na.com/koni-warranty.

Can I upgrade just the rear shocks with 8205-1006, or do I need to replace the fronts too?
You can install 8205-1006 on the rear only it is a standalone rear replacement. However, for a balanced handling upgrade across all four corners of the 2014–2024 Ram ProMaster, pairing with KONI 8705-1332 Special Active front struts is recommended. A mismatched front/rear damping setup is not harmful, but matching the technology front and rear gives you the most consistent ride and handling profile.

Is this the same shock used as OEM on some European ProMaster/Ducato variants?
KONI Special Active technology is proven as original equipment on over 10 million vehicles worldwide. The Fiat Ducato platform (which the Ram ProMaster is based on) has been offered with KONI dampers in various markets. The 8205-1006 is validated to OEM fitment specifications for the 2014+ Ram ProMaster sold in North America.