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lowering question

D

dtroit36

New member
I have an 04 GP GT and just acquired some eibach springs at a real cheap price. I've been doing alot of reading and on the forum and I still have questions about the engine mount/trans mount spacing to get rid of the vibes. I haven't installed the springs yet due to the fact I live in MI and its just too cold, but I'd like to get everything I need before I do the install. I see that ZZP has some spacers that you can buy from them for 20 bux, but I see the picture and they just look scary unsafe, and I see that a gentleman on here makes them to sell. What do you guys suggest for me? Thanks in advance! -mike
 


Well I have had gone through two GPs with lowering springs, SSC Gen 2s, and I have never had to use to spacers to cut out vibration. I guess it is all dependant on the drop of the springs in regards to how it will affect your ride. Now on my old GT I felt the 60mph vibration for like 2 seconds and it was gone. I never had any other issues with it. And now with my GTX i have the same spring setup on it, but I have polymounts for the motor mounts and dogbones and I feel ZERO vibration and no shims needed to align the axels.

I only had to add camber bolts to the tops of each strut to help with the alignment, but that has been it so far. But from what I remember the Eibach's dont get seriously low in their stance. So you "might not" have to get them. The only true way you are gonna tell is put them and see what happens in the first week or two of driving on them. It takes about a good week for them to truly settle to their actualy height.
 
the reason it does it is because the axel geometry gets out of whack when you lower the car. it does it less when you drop the car less. eibach springs are one of the lower ones, so you might get the shakes (i have them on my car and it shook pretty bad). it also depends on the condition of your motor/trans mounts. new ones seem to take it better than old ones. the fix is to raise the engine and trans so that the axels are at the right angle again. there are two solutions:

A) motor/trans mount spacers: the "right" way to do it, but you will have hood clearance issues (possibly) if you run an intercooler

B) shorter dogbones: the "kinda right" way to do it, but your headers might hit the front fans (not a big deal, mine rest on them) and your motor mounts get beat up because they are being pulled in an undesireable direction.


i have shorter dogbones and they have worked out well. they were also free since i did them on my own.
 
Bio248 said:
the reason it does it is because the axel geometry gets out of whack when you lower the car. it does it less when you drop the car less. eibach springs are one of the lower ones, so you might get the shakes (i have them on my car and it shook pretty bad). it also depends on the condition of your motor/trans mounts. new ones seem to take it better than old ones. the fix is to raise the engine and trans so that the axels are at the right angle again. there are two solutions:

A) motor/trans mount spacers: the "right" way to do it, but you will have hood clearance issues (possibly) if you run an intercooler

B) shorter dogbones: the "kinda right" way to do it, but your headers might hit the front fans (not a big deal, mine rest on them) and your motor mounts get beat up because they are being pulled in an undesireable direction.


i have shorter dogbones and they have worked out well. they were also free since i did them on my own.
Click to expand...


I read up on the Edibachs and they state they only drop 1" in both the front and rear? Have they changed since you got yours?

I agree about the dogbone problem you mentioned. I personally would go with some good polymounts to solve the trick without the risk of using shortened or "off set" dogbones to help with this issue.

The spacer issue, Bio is right on about. You can also get polymont engine and tranny supports that will be lower than stock, and you can use the shims to put the engine back to its original height without comprimising to much engine to hood space.

Just some thoughts :)
 
the eibachs are supposed to be a 1.3" drop, but they lower more than that. it is closer to 2" if not more. my car is low.

most of the advertised drop rates are off. they usually drop more.
 


ok...thats what i've been noticing...i'm thinking about getting the dogbones right away and if I still get the vibs i'll get a half set of vinnies spacers
 
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