markboris

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Thanks for the detailed write up and review!

I'm located in Oakland CA and would love to pay somebody to have this installed on my '23 GT PE to improve the bouncy suspension. I have a bunch of speed bumps in my neighborhood and every time I go over one — even at low speeds, I feel like I'm being thrown around on a violent rollercoaster.
Austin, my personal opinion would be to try and contact one of the members here on the forum that we have installed the Rally springs on. Maybe Igor or John (that live more in the SF area) and soon Eric (will be installing his three weeks from now) which lives closest to you in the east bay and see how the car rides over those speed bumps. While the Rally springs lessens the rear bouncing, if that is your only complaint and not that the car rides harsh, maybe the Koni rear shocks that I modded for cars with bouncy rear ends might be better for you.
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JohnFoxeSheets

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Austin, my personal opinion would be to try and contact one of the members here on the forum that we have installed the Rally springs on. Maybe Igor or John (that live more in the SF area) and soon Eric (will be installing his three weeks from now) which lives closest to you in the east bay and see how the car rides over those speed bumps. While the Rally springs lessens the rear bouncing, if that is your only complaint and not that the car rides harsh, maybe the Koni rear shocks that I modded for cars with bouncy rear ends might be better for you.
Good idea, Mark. @austinsf, if you want to do this, let me know and we can try it sometime...
 

raffig

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After doing this modification very recently to my Premium ExtAWD I am very happy with the results. The violent bouncing is gone, it is a much more comfortable ride. @austinsf I am also in Oakland, you are welcome to come and try it out.
 

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After doing this modification very recently to my Premium ExtAWD I am very happy with the results. The violent bouncing is gone, it is a much more comfortable ride. @austinsf I am also in Oakland, you are welcome to come and try it out.
Will DM you! I just ordered 2x RK9Z-5310-A and 2x RK9Z-5560-B from TascaParts and am still on the fence about the Eibach bars, since they're $598.13 shipped... I read through @mkhuffman's explanation here about the impact of the aftermarket bars, but I'm not convinced if I'm personally bothered enough by the side to side rocking.

Did you change your springs and install the aftermarket bar?

edit: bought the bar 😂
 
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IgorKl

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Will DM you! I just ordered 2x RK9Z-5310-A and 2x RK9Z-5560-B from TascaParts and am still on the fence about the Eibach bars, since they're $598.13 shipped... I read through @mkhuffman's explanation here about the impact of the aftermarket bars, but I'm not convinced if I'm personally bothered enough by the side to side rocking.

Did you change your springs and install the aftermarket bar?
hi,
I’m in Pacifica but driving around Bay Area a lot, will be on East Bay on Friday so if you want we can meet after 4pm on Friday.

sway bars - IMHO: it’s a must- it helps to mitigate body roll. Especially that Rally springs raise a little bit car and softer than OEM springs.
 


raffig

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Will DM you! I just ordered 2x RK9Z-5310-A and 2x RK9Z-5560-B from TascaParts and am still on the fence about the Eibach bars, since they're $598.13 shipped... I read through @mkhuffman's explanation here about the impact of the aftermarket bars, but I'm not convinced if I'm personally bothered enough by the side to side rocking.

Did you change your springs and install the aftermarket bar?

edit: bought the bar 😂
Yes, I did rally springs AND Aftermarket bars. I totally agree with Igor and Mark, the bars are a must to offset the softer rally springs.
 

J. M.

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Hello all & greetings from Britain.

I'll jump straight in.

We've got a 2021 1st edition AWD extended range, I've contacted our local Ford dealership with the part numbers listed here, with a view to ride improvement. But the numbers are a little different & wonder is they are in fact the right ones. Are these simply an UK / EU code variant or a completely different part?

As fitted Currently to our car and is listed as a Ttitanium version 2 ESO market derivative.

LJ9C-5310-ENA Front £61.27 incl.
LJ9C-5560-ANH Rear £114.20 incl.

And the possible lift springs with differing part numbers, the helpful parts person had no data on spring specifics, size etc. on the parts system.

Sport appearance pack springs.
RK9C-5310-ABB Front
RK9C-5560-ABC Rear

£115.35 each incl VAT £461.40 parts only.
Fitted £951.02 Incl VAT. Aug 2025.

I did wonder if we should source the Eibach lift kit, Part# E30-35-054-01-22 Pro-Kit ?, I approached a UK eBay seller who are offering the lowering springs at £241, but they seemed to say that only the lowering or standard springs would fit the car; which makes little sense to me. eBay Listing: https://www.ebay.co.uk/itm/326082529752 The price is more attractive at least.

Any thoughts on that option?

Cheers, and stay shiny side up ;-)

JM
 

markboris

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Hello all & greetings from Britain.

I'll jump straight in.

We've got a 2021 1st edition AWD extended range, I've contacted our local Ford dealership with the part numbers listed here, with a view to ride improvement. But the numbers are a little different & wonder is they are in fact the right ones. Are these simply an UK / EU code variant or a completely different part?

As fitted Currently to our car and is listed as a Ttitanium version 2 ESO market derivative.

LJ9C-5310-ENA Front £61.27 incl.
LJ9C-5560-ANH Rear £114.20 incl.

And the possible lift springs with differing part numbers, the helpful parts person had no data on spring specifics, size etc. on the parts system.

Sport appearance pack springs.
RK9C-5310-ABB Front
RK9C-5560-ABC Rear

£115.35 each incl VAT £461.40 parts only.
Fitted £951.02 Incl VAT. Aug 2025.

I did wonder if we should source the Eibach lift kit, Part# E30-35-054-01-22 Pro-Kit ?, I approached a UK eBay seller who are offering the lowering springs at £241, but they seemed to say that only the lowering or standard springs would fit the car; which makes little sense to me. eBay Listing: https://www.ebay.co.uk/itm/326082529752 The price is more attractive at least.

Any thoughts on that option?

Cheers, and stay shiny side up ;-)

JM
Hi JM,

As you have most likely read in several posts of mine (and others), the best way to achieve a more comfortable ride is to replace your springs with the OEM Rally springs and sway bars with the Eibach sway bars. There are other ways you can soften the ride a bit but nothing will do it as much as the OEM Rally springs and Eibach sway bars. It is important to change the sway bars at the same time because: 1. The Rally springs soften the ride and the handling will suffer a bit. The Eibach bars will bring back the handling and then some. Car will handle much better than before. 2. The OEM bars have a vulcanized rubber mounted bushing that does not allow the bar to articulate giving a more firm ride. The Eibach bars do not have this mounting setup and allow the car to ride smoother while handling better. 3. Since you have to disconnect the end links of the sway bars to install the springs, it's cheaper for the install labor to do the bars at the same time.

Now, as far as the part numbers you got for the "Sport" springs, those look like manufacturing numbers which sometimes have a few extra letters at the end. The part number is what is listed in the Ford parts catalog that the dealer would order from. The manufacturing number is what is attached or moulded into the part itself. Most Ford parts have a manufacturing number on them. This number is NOT the part number although it may be very close and sometimes not even close at all. That said, the manufacturing number you have for your rear "Sport" spring is the same as the Rally rear sport spring but the suffix is one digit off which is just the revision number. . Those "Sport" springs are the same as the Rally springs. If you look in John's first post of this thread, he lists the exact measurements of the springs that I took. You mentioned that the parts person did not know specifics of the springs and that is true. None of the dealers have any specific info on the springs. Basically, to know if you have the Rally springs, the suffix (last three digits at the end of the manufacturing number on the white tag) Must end with either "ABB" or "ABC" for the front springs and "ABC" or "ABD" for the rear springs.

The person on eBay that told you certain springs would not fit on your car, they are wrong. As you assumed, any Mach-E springs will fit and work on your car but I would not be buying springs from them anyway. You never know what you will be getting when it comes to something like springs. I would only purchase directly from a Ford dealer. As a side note, I have shipped many items to the UK (and Europe, Asia, Australia for that matter) so if it comes to the point where you are having issues getting the correct parts, let me know and I can find out the cost of shipping the springs.

I have a set of Rally springs here because I'm installing them in a member's car this weekend (my 4th Rally spring install). It just makes it easier if they ship me the springs since we do the install at my home. Below is an example of what I was talking about between the part number and manufacturing number.

Front Rally spring part number tag. This part number tag is attached to the spring for shipping purposes only. All springs are shipped from the springs manufacturer with only the manufacturing number tag.

Ford Mustang Mach-E Mach-E Rally Springs installed on 2022 (non-PE) GT - comprehensive(ish) review IMG_8616


Front Rally spring manufacturing number tag which is attached to the spring after it is made.

Ford Mustang Mach-E Mach-E Rally Springs installed on 2022 (non-PE) GT - comprehensive(ish) review IMG_8617


Rear Rally part number tag.

Ford Mustang Mach-E Mach-E Rally Springs installed on 2022 (non-PE) GT - comprehensive(ish) review IMG_8618


Rear Rally manufacturing number tag.

Ford Mustang Mach-E Mach-E Rally Springs installed on 2022 (non-PE) GT - comprehensive(ish) review IMG_8619


Bottom line, you need these exact PART numbers for the Ford OEM Rally springs and Eibach Sway Bars:

Quantity 2 - Part #: RK9Z-5310-A (Front) Manufacturing number suffix must end in either ABB or ABC
Quantity 2 - Part #: RK9Z-5560-B (Rear) Manufacturing number suffix must end in either ABC or ABD

Eibach Sway Bar kit Quantity 1 - Part #: E40-35-054-01-11
 
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Hi JM,

As you have most likely read in several posts of mine (and others), the best way to achieve a more comfortable ride is to replace your springs with the OEM Rally springs and sway bars with the Eibach sway bars. There are other ways you can soften the ride a bit but nothing will do it as much as the OEM Rally springs and Eibach sway bars. It is important to change the sway bars at the same time because: 1. The Rally springs soften the ride and the handling will suffer a bit. The Eibach bars will bring back the handling and then some. Car will handle much better than before. 2. The OEM bars have a vulcanized rubber mounted bushing that does not allow the bar to articulate giving a more firm ride. The Eibach bars do not have this mounting setup and allow the car to ride smoother while handling better. 3. Since you have to disconnect the end links of the sway bars to install the springs, it's cheaper for the install labor to do the bars at the same time.

Now, as far as the part numbers you got for the "Sport" springs, those look like manufacturing numbers which sometimes have a few extra letters at the end. The part number is what is listed in the Ford parts catalog that the dealer would order from. The manufacturing number is what is attached or moulded into the part itself. Most Ford parts have a manufacturing number on them. This number is NOT the part number although it may be very close and sometimes not even close at all. That said, the manufacturing number you have for your rear "Sport" spring is the same as the Rally rear sport spring but the front is one digit off. I am thinking those "Sport" springs might be the same as the Rally springs but I cannot say for certain. If you look in John's first post of this thread, he lists the exact measurements of the springs that I took. You mentioned that the parts person did not know specifics of the springs and that is true. None of the dealers have any specific info on the springs.

The person on eBay that told you certain springs would not fit on your car, they are wrong. As you assumed, any Mach-E springs will fit and work on your car but I would not be buying springs from them anyway. You never know what you will be getting when it comes to something like springs. I would only purchase directly from a Ford dealer. As a side note, I have shipped many items to the UK (and Europe, Asia, Australia for that matter) so if it comes to the point where you are having issues getting the correct parts, let me know and I can find out the cost of shipping the springs.

I have a set of Rally springs here because I'm installing them in a member's car this weekend (my 4th Rally spring install). It just makes it easier if they ship me the springs since we do the install at my home. Below is an example of what I was talking about between the part number and manufacturing number.

Front Rally spring part number tag. This part number tag is attached to the spring for shipping purposes only. All springs are shipped from the springs manufacturer with only the manufacturing number tag.

IMG_8616.webp


Front Rally spring manufacturing number tag which is attached to the spring after it is made.

IMG_8617.webp


Rear Rally part number tag.

IMG_8618.webp


Rear Rally manufacturing number tag.

IMG_8619.webp


Bottom line, you need these exact PART numbers for the Ford OEM Rally springs and Eibach Sway Bars:

Quantity 2 - Part #: RK9Z-5310-A (Front)
Quantity 2 - Part #: RK9Z-5560-B (Rear)

Eibach Sway Bar kit Quantity 1 - Part #: E40-35-054-01-11
You. Are. The. Best. Mark!
 

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I second that & thrice so !


Thank you V E R Y much Mark.


I've emailed a UK Eibach supplier & will contact our local Ford dealer too. I've a found for sale via a national car sales site a 2025 Rally and can use it's registration number to see if that pops up a different spring part number from the dealer, but that may have MagnaRide, we'll see? Might that be incompatible?

So a couple of possible paths to produce a more comfortable ride on our... Smoothly surfaced roads ;-)

Would the Eibach be OK too, being possibly quite a bit less expensive, but not OEM?

Cheers !

JM
 
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I second that & thrice so !


Thank you V E R Y much Mark.


I've emailed a UK Eibach supplier & will contact our local Ford dealer too. I've a found for sale via a national car sales site a 2025 Rally and can use it's registration number to see if that pops up a different spring part number from the dealer, but that may have MagnaRide, we'll see? Might that be incompatible?

So a couple of possible paths to produce a more comfortable ride on our... Smoothly surfaced roads ;-)

Would the Eibach be OK too, being possibly quite a bit less expensive, but not OEM?

Cheers !

JM
The Rallys do have MagnaRide, but the springs from the Rally work with other model Mach Es. with OEM Ford shocks.
 

markboris

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I second that & thrice so !


Thank you V E R Y much Mark.


I've emailed a UK Eibach supplier & will contact our local Ford dealer too. I've a found for sale via a national car sales site a 2025 Rally and can use it's registration number to see if that pops up a different spring part number from the dealer, but that may have MagnaRide, we'll see? Might that be incompatible?

So a couple of possible paths to produce a more comfortable ride on our... Smoothly surfaced roads ;-)

Would the Eibach be OK too, being possibly quite a bit less expensive, but not OEM?

Cheers !

JM
As what John said above. All Mach-E springs will fit all models. Don't concern yourself with what shocks are on the car.

Are you asking would the Eibach lift springs be ok? That would be no they are not. The only Eibach springs that are softer are their GT progressive lowering springs. They will soften the ride but not as much as the OEM Rally springs. The Eibach GT Progressive Lowering springs where the ones that many were installing to get a softer ride, that plus of course the Eibach sway bars. Thing is, not everyone is able to run a car that is lower because of driveways, curbs and if you frequently load up the car with rear seat passengers the car bottoms out more frequently.

Over here, the OEM Rally springs run about $90 each which is not much more than the Eibach springs.

This weekend I am installing Rally springs on a member's car (Eric) that we have installed two other sets of springs. The car is a '21 Premium and the first set of springs we installed were the Eibach lift springs (we had installed the Eibach Sway Bars at an earlier time). Thinking since they lift the car and give more suspension travel, the ride would be a lot smoother. While they did smooth out some imperfections in the road, it was not as much as Eric had hoped for. This is mainly because they are still linear springs with a 1000 spring rate like the Premium OEM springs. That only lasted one month then we installed the Eibach GT progressive lowering springs which did help more to soften the ride. This was all done early last year and while Eric likes the way the car rides, he often has passengers in the rear on long drives and the car bottoms out frequently. Now this weekend we are installing the OEM Rally springs and from all of the other members that have done this, I'm pretty sure Eric will be very happy. Third time's a charm? 😊

A couple of links on Eric's Eibach lift spring install/review:

https://www.macheforum.com/site/thr...-anti-roll-sway-bars.32640/page-3#post-753169

https://www.macheforum.com/site/thr...-anti-roll-sway-bars.32640/page-4#post-753744

Link on Eric's Eibach GT progressive lowering springs install/review:

https://www.macheforum.com/site/thr...ng-springs-on-a-gtpe.33310/page-4#post-770182

And you've probably read the posts/reviews from John, Igor and others that have installed the OEM Rally springs.
 
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J. M.

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Thank you Mark, in that case it's OEM for our use case. Lower would not be useful here.

Cheers

JM.
 

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Anyone know of a shop in So Cal that has installed the Rally springs?
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