UPDATED: Replacing Rear Shocks: Reducing the rear end bounce.

[Dysan911]

I have a set of traditional 4ton jack stands. I found some rubber adapters that fill in the cradle area of the jack. I jack up the car first with my puck and floor jack and then slide the jack stand under the rail. Works great if you need the entire side, front or rear suspended at the same time.

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[Dysan911]

I see. Ok, that’s for the gen 5 Mustang and they are clearly different mounting points than the later ones. Summit Racing has the 1240s for $176 each. Doesn’t sound too bad. I’ve bought from Summit in the past. No worries
dealing with them.

yep. Tire rack has them as well for the same cost & free shipping. They ship out super fast same day as a bonus.

 

[rreddy3]

I have a set of traditional 4ton jack stands. I found some rubber adapters that fill in the cradle area of the jack. I jack up the car first with my puck and floor jack and then slide the jack stand under the rail. Works great if you need the entire side, front or rear suspended at the same time.

TONDA Jack Stand Pads, Universal... https://www.amazon.com/dp/B0BG1H2BVR?ref=ppx_pop_mob_ap_share

That’s a good tip. Thanks. I see how they’d work. Slip over top of axle post. I could use them on the US Jack (made in Michigan, USA) jackstands I have. My AOSK pucks just arrived. Bit by bit the project is coming together.

 

[rreddy3]

yep. Tire rack has them as well for the same cost & free shipping. They ship out super fast same day as a bonus.

Thanks. They’re very good too. Bought many tires from them over the years.

 

[Bruboy]

Bilsteins or any other shock other than the Koni Sport Yellow's are not an alternative since they have a very soft rebound and are not adjustable. In order to control the bounce you need a shock with a firm rebound and the Koni Sport Yellows have an adjustable rebound.

So are the Konis the better way to go that the Eibach springs

 

[markboris]

So are the Konis the better way to go that the Eibach springs

Are you asking are the Koni's the better way to go THAN the Eibach springs or WITH the Eibach springs?

 

[Bruboy]

Are you asking are the Koni's the better way to go THAN the Eibach springs or WITH the Eibach springs?

Actually both. I have read where the springs help and where the shocks help. I am thinking together they would be even better (best, besides KW), but am wondering if you had to choose one, which would be the best option for ride improvement the Eibachs or Koni?

 

[markboris]

Actually both. I have read where the springs help and where the shocks help. I am thinking together they would be even better (best, besides KW), but am wondering if you had to choose one, which would be the best option for ride improvement the Eibachs or Koni?

They both are for two different things. The Eibach Springs are progressive and will give you a smoother ride over irregular road surfaces. They take the edge (harshness) off. The Koni shocks greatly lessen the rear end bounce over specific road surfaces like repetitive expansion joints on cement freeways and other bumps/dips on roads. The Koni's have an adjustable rebound that you dial up to the firm setting which is what reduces the bounce however it WILL give you a bit harsher ride which is what is being reduced by the Eibach springs. I only recommend the Koni's if you regularly are driving over road surfaces where your car is bouncing all the time since they do give a more firm ride.

If you are looking for a smoother, less harsh ride, install the Eibach Springs. If you have the terrible rear end bounce, install the rear Koni shocks. Nothing wrong with doing both but just remember you will not have as smooth of a ride after installing the Eibach springs if you also have the Koni shocks.

 

[Dysan911]

Nothing wrong with doing both but just remember you will not have as smooth of a ride after installing the Eibach springs if you also have the Koni shocks.

Sorta disappointed to hear this part. I have yet to install my Koni's but if that statement is accurate then I will lower the quality of my ride by installing the Koni Shocks in order to help reduce rear end bounce.

 

[markboris]

Sorta disappointed to hear this part. I have yet to install my Koni's but if that statement is accurate then I will lower the quality of my ride by installing the Koni Shocks in order to help reduce rear end bounce.

Correct. However, the Koni's are adjustable so you can adjust them to the same soft setting as the OEM shocks which will give you a smoother ride but bring back the bounce you had or set it somewhere in between for a balance you like. What is more important to you? Do you really have the rear end bounce all the time? I never ever have rear end bounce because none of the roads around me do not induce this. The Koni's don't bring back all the harshness, just maybe half? Erik would know better on this since he is constantly playing around with the setting on the Koni's depending on his tire pressure, etc. If the bounce really bothers you and you have it all the time, get the Koni's. If too much of the harshness returns for you, back off the rebound setting a bit.

 

[Dysan911]

Correct. However, the Koni's are adjustable so you can adjust them to the same soft setting as the OEM shocks which will give you a smoother ride but bring back the bounce you had or set it somewhere in between for a balance you like. What is more important to you? Do you really have the rear end bounce all the time? I never ever have rear end bounce because none of the roads around me do not induce this. The Koni's don't bring back all the harshness, just maybe half? Erik would know better on this since he is constantly playing around with the setting on the Koni's depending on his tire pressure, etc. If the bounce really bothers you and you have it all the time, get the Koni's. If too much of the harshness returns for you, back off the rebound setting a bit.

For the most part my ride feels great with the exception of a few places that the rear end bounce just seems overly excessive. I of course don't know what Koni's will feel like but as I understand it they offer the adjustable rebound so they'll still feel the same as far as the compression side but not sure I'd know what only Adj Rebound would feel like real world. My hope was just to tweak it a touch with a little extra rebound dampening so that when I hit these little bumps, up and down uneven road conditions I won't have to see out the rearview or side mirror the toy rocking horse seesaw action view.
I'm probably way more in tune to noticing it now that my Brain has some new car-related thing to obsess over lol.

 

[BMT1071]

Correct. However, the Koni's are adjustable so you can adjust them to the same soft setting as the OEM shocks which will give you a smoother ride but bring back the bounce you had or set it somewhere in between for a balance you like. What is more important to you? Do you really have the rear end bounce all the time? I never ever have rear end bounce because none of the roads around me do not induce this. The Koni's don't bring back all the harshness, just maybe half? Erik would know better on this since he is constantly playing around with the setting on the Koni's depending on his tire pressure, etc. If the bounce really bothers you and you have it all the time, get the Koni's. If too much of the harshness returns for you, back off the rebound setting a bit.

I seem to recall you mentioning that you fly out of SMF fairly frequently. Heading out of there on I-5 going down to Fairfield I have experienced the bucking in a number of different rental cars. Do you not take that route, or does I-5 not induce the bucking on the MME?

 

[markboris]

I seem to recall you mentioning that you fly out of SMF fairly frequently. Heading out of there on I-5 going down to Fairfield I have experienced the bucking in a number of different rental cars. Do you not take that route, or does I-5 not induce the bucking on the MME?

I’m only on 5 for the last 7 miles to the airport. I basically live on 49 so it’s 49 to Jackson then 16 to Sac and 5 to the airport. These are all two lane HWY's except for 5.

EDIT:
I would rather drive on roads like this through the hills than 2 hours on a flat HWY. My alternate would be 49 to 4 to Stockton then 5 up to Sac airport. I have done that a few times but never noticed any bounce the one hour I am on 5 from Stockton to Sac airport. I do have a GTPE so the bounce would be less BUT not nearly as less as with the Koni's. When I was testing the Koni's on Anton's car, we took my car over the same stretch of HWY that gives his car the really bad bounce and while my car was about 50% less than his Premium, it was not reduced nearly as much as when I installed the Koni's on his car.

 

[Anton]

Small update on the Koni shocks I have set to firmness setting. At times I wish that the ride quality was slightly less harsh but I sure am glad that the bouncyness is gone.

...
If you are looking for a smoother, less harsh ride, install the Eibach Springs. If you have the terrible rear end bounce, install the rear Koni shocks. Nothing wrong with doing both but just remember you will not have as smooth of a ride after installing the Eibach springs if you also have the Koni shocks.

This sounds like the Eibach springs won't really help the harshness much if you have the Konis? Tring to do some basic cost/benefit analysis here. Maybe I should just try dialing back the Koni's a half-turn.

 

[markboris]

Small update on the Koni shocks I have set to firmness setting. At times I wish that the ride quality was slightly less harsh but I sure am glad that the bouncyness is gone.



This sounds like the Eibach springs won't really help the harshness much if you have the Konis? Tring to do some basic cost/benefit analysis here. Maybe I should just try dialing back the Koni's a half-turn.

Hey Anton, yes dialing back the Koni's a bit will give a slightly better ride but of course will bring back some bounce. Your car was my test mule for these Koni's and I remember when we were taking multiple drives on HWY 41 where there were expansion joints and the back end had quite a bit of bounce, the most firm setting on the Koni's gave us the least bounce. Basically just about eliminated it on your stretch of highway. Replacing the OEM springs with the Eibach GT progressive lowering springs will give a slightly smoother ride and maybe will bring it back to how it was with the OEM springs and the Koni's. It's hard to say as everyone has a slightly different trim car, different roads, etc. The car will also be lower and not sure that is a good thing if you frequently have it loaded down especially in the rear with passengers.

On another note, since your car was the first to get the Koni's that I modded and it has been over a year now that you have had them on the car, is the bounce still greatly reduced and are you still happy with them?

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