My Rally Springs and Eibach Sway Bar Install

[KennyMc]

I can never leave things alone and when it came to my new 2025 Mach E Premium purchase the song remained the same. Upon joining this forum it became clear to me there were a few items that I "needed" to address and a few I would "like" to address.

The need - address the suspension.
I came from an extensive background in lifted trucks as I have been riding dirt bikes for over 45 years. I never thought I would be back at it with a "Mustang'sh" car/suv. Upon reading all the different threads on hear a name kept popping up. @markboris . I reached out to him to pick his brain as he had an extensive post history with what were called Rally springs and Eibach sway bars. I was familiar with Eibach as I just put a suspension lifts on my sons Ford F150 XLT as that has now become my mode of transportation for my bikes since this new Stang wouldn't cut it . We got to talking and he said if I was to venture on up to his house he would install the springs and sway bars.. He was booked until mid November for weekends but said if I could come up during the week he could squeeze me in. This was on a Saturday and he said he was available the next Thursday/Friday. I jumped at the chance so I said to work, "work, Imma taking next Thursday and Friday off". This whole EV thing to me was new so I was nervous on the range issues as I don't have the extended battery. This is my commuting car to work which is only 9 miles one way so I didn't spring the extra $4K for the extended battery. I prolly charged sooner than I needed but I didn't want to be left stranded....

Before it all began

When Mark said he would install the springs I envisioned me with a cocktail in my hand offering my occasional support....well, maybe not so much

At least I had another helper who offered his own form of encouragement

Before measurements;

After the install:

Mark didn't know what the final lift in the front would be as he hadn't worked on a RWD non-extended range vehicle before so he recommended we install a 1/4" spacer in the rear to ensure the front wasn't riding higher than the back since I didn't have the extra weight of a motor or the extra battery. I started with a 1" rake before the install and ended with a 3/4" rake. So if we hadn't put in the 1/4" spacers I would have been around 1/4" to 1/2". Since I came from a truck background I was very pleased with the final result.

To address the additional fender well gap Mark suggested a bigger tire that would both fill in the gap and provide some additional softness in the ride. I ended up with 245/55-19' in the front (255's were just a tad too tall as they would rub on the bottom of the shock tower)and 255/55-19's in the back.

After all is said and done with the Rally springs, Eibach sway bars and bigger tires.

As a bonus Mark added a remote hatchback release buttons so now I can open the hatchback from the drivers seat and not having to go into the menu. And to top it off, the rear lighted pony

And my updated license plate

I can't say enough about Marks graciousness and hospitality to help out a fellow Mach E driver who he met only a few weeks ago. He opened his house to me so I could stay over and make the long drive home in the morning. He is a special kind of guy to do this for me and all of the others he has helped in the past and proly many more in the future. We as a group are very fortunate....thanks @markboris!!!

Edit - I forgot to mention the best part, the ride is much more compliant than before. While it's not Cadillac smooth, it's more like a traditional SUV. The slower speed chatter in the road is much better and the bigger jolts are much less jarring. I can take water culverts in the road at greater speeds. I had one by my house I would take in my Tundra as fast as I could go from the light (about 60mph) and front's would soak it up and the rears would rebound a bit more so the back tires would spin. I can't take it going that fast (prolly 40) and it is just pushing the limits of the springs but It is planted. Very pleased with the car's performance......I i did a separate write up on the install of the BSKT Non GT Grill and lighted Mustangs.

Next up, I will be addressing the sound system, cause I like to go thump in the night....

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[markboris]

Thanks for the kind words Ken! It was great to finally meet you after all of our conversations on the phone. I'm really happy everything worked out so well especially since your drive was 6+ hours to get here.

Oh, and Riley didn't mind you calling her a boy as she gets that a lot.

 

[clarkston]

Any links or advice on others also doing the rear lit pony?

 

[HuntingPudel]

Any links or advice on others also doing the rear lit pony?

The rear lit pony or GT emblem is pretty plug and play. The worst part is fishing the reverse light wiring through the flex channel from the body to the liftgate and that's not all that bad.

 

[cooltatts]

This suspension upgrade and a kick to open would make my 24 Mach-E P4X perfect. Let me know when you come to Canada

 

[KennyMc]

The rear lit pony or GT emblem is pretty plug and play. The worst part is fishing the reverse light wiring through the flex channel from the body to the liftgate and that's not all that bad.

I chose not to install the reverse light function.

 

[MachEVelli]

How are you liking the sway bar? Did you do front and rear sway bars and what setting did you put it at? Looking to get the performance springs and sway bar

 

[KennyMc]

How are you liking the sway bar? Did you do front and rear sway bars and what setting did you put it at? Looking to get the performance springs and sway bar

I did both front and back. I really can't comment on the specific performance of the sway bars as the springs were put on at the same time. @markboris can provide a better perspective. The front's had 2 holes but I don't recall which hole we used and if that was the stiffer one (I think that's the one we chose)....

 

[gutowscr]

Won’t the different size front and rear tires mess with the AWD system? It’s only 11mm difference but still not a match.

 

[markboris]

Won’t the different size front and rear tires mess with the AWD system? It’s only 11mm difference but still not a match.

Ken's car is RWD not AWD so there is no issue. However, if it was AWD, there still would be no issues as I have run staggered tire setups with the same 1.4% difference in diameter front to rear on both of my AWD Mach-E's without issue.

 

[markboris]

How are you liking the sway bar? Did you do front and rear sway bars and what setting did you put it at? Looking to get the performance springs and sway bar

Let me say first that the Eibach Anti-Roll Bars are the single best mod that I have done on my 3 Mach-E's and I do a ton of mods. They greatly reduce the body roll which promotes much flatter cornering. They also give you a smoother ride because of the way they are mounted to the body. Their polyurethane bushings allow the bar to smoothly move up and down which does not affect the ride. The OEM bars have rubber bushings that are vulcanized bonded to the bar not allowing it to move freely. They act like a spring and will stiffen the ride especially going over things like speed bumps.

I recommend changing the bars when installing the Rally springs as they will further smooth out the ride and you are in that area of the car anyway when replacing the springs. Also, the Rally springs being about 30% softer gives you more body roll than OEM springs so replacing the bars will lessen that body roll. The handling won't be as flat as if you had the OEM springs but it will be a bit better than the OEM springs and bars.

On Ken's car we went with the firmer setting for the front bar. Normally on a non-GT Mach-E I leave the front bars on the normal setting. On the GT's I always use the firmer setting since the GT's have wider tires and most of the ones I have worked on have performance summer tires that can handle the extra force the sway bars add to the tires on that setting. On Ken's Premium we used the firmer setting. I did this because I wanted to control the softer rally springs that create more body roll and I also know Ken was going with wider tires which would be able to handle a bit more force than his skinny OEM tires even if they were all seasons. I explained to him if there was too much understeer going into hard corners he would need to change the setting on the front bar to the normal setting. I don't think Ken drives the car really hard anyway beings it is his commute car and if he did, knowing him would have gotten a GT.

 

[MachEVelli]

Thanks for the reply Mark.

I’ve been wanting to install sway bars on my ’25 Premium. I drive it aggressively, which is probably why I should’ve gotten a GT. However, I’m not sure which sway bar setting to choose. I’m considering the Eibach performance springs, which lower the ride but have progressive springs in the rear. I’m also thinking about adding spacers to square the ride to the frame. I’m not sure if this has been done before, and I’m looking for recommendations on the best sway bar settings and spacer sizes for my MME. Do you have any experience with these modifications?

 

[markboris]

Thanks for the reply Mark.

I’ve been wanting to install sway bars on my ’25 Premium. I drive it aggressively, which is probably why I should’ve gotten a GT. However, I’m not sure which sway bar setting to choose. I’m considering the Eibach performance springs, which lower the ride but have progressive springs in the rear. I’m also thinking about adding spacers to square the ride to the frame. I’m not sure if this has been done before, and I’m looking for advice on the best sway bar settings and spacer sizes for my Mach-E. Do you have any experience with these modifications?

I have installed many sway bars both Steeda and Eibach. I recommend Eibach only because the bars are matched in shape exactly like OEM and will not interfere with any suspension and body parts like I and ofter members have had. Not to mention the Eibach bars use the OEM end links while Steeda requires you to use their front end links which we all have had problems with.

That said, I recommend when you install the Eibach bars that you run the fronts on the normal setting to start out with since you will most likely not be changing any other suspension parts or tires. I think it will be a good balance. See how it feels for you and if you want it a little more from up front, then it's easy to change the front bar setting to the firmer one but you will get a bit more understeer.

I had installed the Eibach GT lowering springs on my '21 GTPE and have installed them on several other members cars. They work very well both softening the ride a bit since they are progressive and also firming up quite when when cornering aggressively. The combination of the Eibach GT springs and sway bars work very well.

I have used spacers in the rear to raise it up a bit for people who want more than a slight rake and for compensating when installing different springs but I have never squared the ride to the frame on a Mach-E. There are no spacers available to raise the front and you would have to custom make your own if need be.

 

[MachEVelli]

That’s great! It’s very informative. I’m glad to hear that the specific combination is working well. I was referring to wheel spacers that push the wheels outward. I noticed that Eibach had them available.

 

[markboris]

That’s great! It’s very informative. I’m glad to hear that the specific combination is working well. I was referring to wheel spacers that push the wheels outward. I noticed that Eibach had them available.

Sorry, didn't know that's what you meant. I have custom wheels on most my cars that I spec with offsets that give me a flush fitment. I don't normally use spacers but many here have. Using a 15mm spacer will give a good fit for the Mach-E and the 20mm will have a very slight poke but it does depend on the camber setting and tires you have. Also, the 15mm spacers don't always work with the OEM wheels as the studs may protrude too far into the wheel causing it not to sit flush against the rotor.

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