Koni FSD Red Rear Shock 8805-1057 for RAM ProMaster Vans


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Koni FSD Red Rear Shock 8805-1057 for RAM ProMaster Vans

This product is compatible with all RAM ProMaster Vans. 

All Sprinter Store parts are backed by warranties. The Sprinter Store has been repairing and installing Sprinter Van parts for over a decade, the parts we sell are tested to the greatest standard. We stand behind our manufacturers and ensure every part is of the utmost quality.  

Note: The mounting hardware for this shock is sold separately, please email [email protected] and we will send you the necessary hardware. 

I see that Koni likes to use this FSD thing all the time. I have to admit that I have no idea what that means at all. Could you tell me what they are trying to tell me by saying a product is FSD?

The acronym is short for frequency selective damping.

Ok, but I have no idea what that even means for me. Could you tell me what that means?

There is a bit of dichotomy when it comes to comfort and handling. Many people find comfort levels with the suspension system moving in a high-frequency area of around 10 Hz. The handing, the manufacturer says, tends to improve with the suspension system moving in a low-frequency area of around 1 Hz. Comfort requires low damping forces while handling requires high damping forces. The answer to the problem is to change the damping force in relation to the frequency of movement. FSD shocks are meant to do this for you without you needing to do anything extra once the shock is on your vehicle.

Do you know the dimensions of this shock?

The dimensions are listed at 18 x 3 x 2.8. The dimensions are listed as length x width x height.

Do you know what this shock is made of?

It is made of steel.

So this shock is made to adjust to the road without me doing anything?

Correct. FSD shocks are made to adjust to the terrain you meet and changing the dampening level to give you both comfort and handling at the same time.

How fast does this shock from Koni do that?

They say that this all happens in a fraction of a second.

What else is special about this shock?

Koni says that they added a valve which controls the parallel oil flow that is adjacent to the one going through the piston. The parallel oil flow can be shut off by the FSD feature. The result is a damping force that is linear to the time that the piston is moving. Koni says that means that this is a hydraulic amplifier that is able to push the buildup of pressure even later than ever before in order to help the shock do its job more efficiently.

I have low profile tires. Is this going to help the feel of them?

Koni says that these FSD shocks do help the feel and comfort of low profile tires just like yours.

So, I don’t need to add sensors or anything else for this shock to work?

No. The system will work on its own as soon as it is installed.

DISCLAIMER: The information we present here is from the manufacturer. There are no guarantees as it relates to the completeness, correctness or actualization of the information on this page. Sprinter Store cannot be held responsible for the content of this information or the consequences of using the information. Dimensions are indicative and for information purposes only.

Proposition 65 information available here – https://www.sprinterstore.com/proposition-65-california-cancer-warnings/.


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Weight 6 lbs
Dimensions 18 × 4 × 4 in