Fox Suspensión Noise

PonyGTrider · Nov 24, 2025

Hi all,
Hope to get some ideas about how to solve this suspension issues On my 90 GT I have Bilstein all around. At the front I have BSN-F4V36413bh5 (BSN-35-041382)and have a noise specially out of the driver side strut. The strut has no leaks and damps very good but there is a play and knocking sound when pushing/pulling from the top of the tire. It seems like the cartridge is moving inside the yellow tube.
If anyone is using the same struts did you have or having the same issue? If you fixed it how did you resolved that?
On the pic I indicate with a green arrow the point where I feel of a bit of too much play and the rd arrows the the direction the cartridge moveing inside the yellow tube (not talking up/down but Inward/outward)
The noise is too annoying considering that those struts are stiff, have polyurethane control arm bushings and spherical camber plate bearings. So the suspension is very solid and any over play magnifies the noise exponentially.
Those struts aren’t cheap as to have the replace them…

I appreciate any help regarding this issue

General karthief · Nov 24, 2025

the yellow cover metal?
Is the yellow cover contacting the tube inside?
I had a rattle and it was the cover that broke loose, I would some cloth material and loosely push some into the top of the yellow tube and check if the rattle goes away.

PonyGTrider · Nov 24, 2025

General karthief said:
the yellow cover metal?
Is the yellow cover contacting the tube inside?
I had a rattle and it was the cover that broke loose, I would some cloth material and loosely push some into the top of the yellow tube and check if the rattle goes away.

Yes that yellow piece is a seamless tube and have the two plates bracket where the spindle is bolted. The cartridge is bolted at the bottom of the tube.
The yellow tube has something similar to a seal on the lip where the cartridge is inserted.
That sounds like a good idea to stuff some liner as you’re suggesting, I’ll try that.
Thanks

PonyGTrider · Nov 24, 2025

My struts are the B6 and they look like the one on this link.

View: https://youtu.be/y7vt5Q6sPvY

AeroCoupe · Nov 24, 2025

Have you called Maximum Motorsports?

PonyGTrider · Nov 24, 2025

AeroCoupe said:
Have you called Maximum Motorsports?

No I haven’t…

gkomo · Nov 24, 2025

I have some bilstein struts sitting in their boxes in my garage. I can see if they do what you are describing unless that’s not very helpful.

I ordered mine from MM so I can’t guarantee the P/Ns are the exact same though.

PonyGTrider · Nov 25, 2025

gkomo said:
I have some bilstein struts sitting in their boxes in my garage. I can see if they do what you are describing unless that’s not very helpful.

I ordered mine from MM so I can’t guarantee the P/Ns are the exact same though.

I bought mine from Summit Racing and didn’t have that much play as new, there must be some sort of teflon collar on the strut body lip where the cartridge slides in which probably is a bit worn out.
Thanks

PonyGTrider · Nov 25, 2025

It seems by judging from this blurred pic the strut tube has a plastic bushing inserted at the top of it, I wonder if I can make a tighter fit self lubricating plastic insert to eliminate the excessive cartridge play inside the strut tube, or if it is there a replacement bushing/insert available please share…

Thanks

PonyGTrider · Dec 27, 2025

Following up on the issue described on this post I just contacted Bilstein technical support trying to find out if the strut body tube has an insert bushing at the top of the tube and if they have some sort of replacement kit, but have no idea how long would I get a reply.
In the meantime if you have had experienced an issue like mine and found the solution to it please feel free to comment, I will certainly appreciate any help.
Thank you and have Happy holidays!!!

Mindseye007 · Apr 8, 2026

PonyGTrider said:
Hi all,
Hope to get some ideas about how to solve this suspension issues On my 90 GT I have Bilstein all around. At the front I have BSN-F4V36413bh5 (BSN-35-041382)and have a noise specially out of the driver side strut. The strut has no leaks and damps very good but there is a play and knocking sound when pushing/pulling from the top of the tire. It seems like the cartridge is moving inside the yellow tube.
If anyone is using the same struts did you have or having the same issue? If you fixed it how did you resolved that?
On the pic I indicate with a green arrow the point where I feel of a bit of too much play and the rd arrows the the direction the cartridge moveing inside the yellow tube (not talking up/down but Inward/outward)
The noise is too annoying considering that those struts are stiff, have polyurethane control arm bushings and spherical camber plate bearings. So the suspension is very solid and any over play magnifies the noise exponentially.
Those struts aren’t cheap as to have the replace them…

I appreciate any help regarding this issue

other then the problem your having, how did it ride prior to your isue?

PonyGTrider · Apr 8, 2026

Mindseye007 said:
other then the problem your having, how did it ride prior to your isue?

It has been always too stiff from day one but I’m getting too tired of it.

Fox Suspensión Noise

PonyGTrider

General karthief

wonder how much it would cost to ship you a pair

PonyGTrider

PonyGTrider

AeroCoupe

lube between the nut and the face. I know my lubes

PonyGTrider

gkomo

now i can hopefully expect to receive the shaft

PonyGTrider

PonyGTrider

PonyGTrider

Mindseye007

10 years still blowing strong

PonyGTrider

Similar threads

Fox Suspensión Noise

wonder how much it would cost to ship you a pair

lube between the nut and the face. I know my lubes

now i can hopefully expect to receive the shaft

10 years still blowing strong

Similar threads

Privacy & Transparency

Privacy & Transparency