To Raise or to Lower
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Joined: Dec 2009
Posts: 702
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From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
To Raise or to Lower
Just trying to think of a cost effective way to accomplish this. I need to either Lower the rear of the car .75 with factory springs or raise the rear of the car .50 with the Hotchkis springs.
After my LS swap the nose sat too high so I cut 1/2 a coil from the front springs to bring it back down. Well it kinda brought it down a bit more than I wanted. So I tried to match it with 1" springs for the rear. It kinda dropped it about 1.5" so now the rear is lower than the front. I don't realy want a lowered car but the rear just looks stupid either way and I am not sure how to get in the middle?
Any Ideas??
After my LS swap the nose sat too high so I cut 1/2 a coil from the front springs to bring it back down. Well it kinda brought it down a bit more than I wanted. So I tried to match it with 1" springs for the rear. It kinda dropped it about 1.5" so now the rear is lower than the front. I don't realy want a lowered car but the rear just looks stupid either way and I am not sure how to get in the middle?
Any Ideas??
Re: To Raise or to Lower
Do you have spring isolators? They make around 1/2 to 3/4 of an inch difference. (meaning taller) People usually remove the isolators to lower there car, however in your case if they are not present I would install a set in the rear and see if it makes your stance better.
Joined: May 2007
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From: Montreal, Canada
Car: 1986 Chevrolet Camaro IROC-Z28
Engine: TPI 310ci (LB9)
Transmission: Custom Rebuilt 700R4 - 2600 Stall
Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip
Re: To Raise or to Lower
i second that, if you get 4th gen rear isolators, they are thicker in the rear than the 3rd gen ones so even if your car has em', you could always replace them with the thicker ones and raise the rear slightly.. I don't know by how much but my guess is around 1/4" to 1/2"?
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From: Iowa
Car: 92 Camaro RS
Engine: LS1
Transmission: T56
Axle/Gears: 10bolt w3.42 Torsen
Re: To Raise or to Lower
http://www.energysuspension.com/prod...-Isolator.html
Not sure if these will work but worth looking into.
Not sure if these will work but worth looking into.
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
Thanks, yes mine have upper isolators but no lowers. The fourth gen ones you speak of are they the uppers? Reason being is that I have never seen any lower isolators on any third gen I have had??? But I think I saw some on the internet? So lowers exist?
Re: To Raise or to Lower
I'm 99% sure there are no lower isolators. However if you want to try out fourth gen isolators over your third gen ones, you should notice a ride height increase of 1/4 - 1/2 inch.
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Joined: Aug 2004
Posts: 1,051
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From: Iowa
Car: 92 Camaro RS
Engine: LS1
Transmission: T56
Axle/Gears: 10bolt w3.42 Torsen
Re: To Raise or to Lower
I've never seen or heard of lowers. My understanding is the rubber isolators were only to stop the transfer of road noise to the body.
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Joined: May 2007
Posts: 2,340
Likes: 2
From: Montreal, Canada
Car: 1986 Chevrolet Camaro IROC-Z28
Engine: TPI 310ci (LB9)
Transmission: Custom Rebuilt 700R4 - 2600 Stall
Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip
Re: To Raise or to Lower
Interesting about the lowers.. Maybe that would make the ride less harsher perhaps? LOL
Re: To Raise or to Lower
I was under the impression that they where in place to keep the spring from rusting to the spring perch? That and most importantly to keep the metal on metal squeaking at bay.
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
I got these #s from LS1tech. They are for a fourth gen.
uppers # 10290379
Lowers # 10247105
I ordered the lowers from the chevy house today and they will be here tomorow. I will let you know how they do. Thanks all!
uppers # 10290379
Lowers # 10247105
I ordered the lowers from the chevy house today and they will be here tomorow. I will let you know how they do. Thanks all!
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Joined: Sep 2011
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From: Spring Hill, Fl.
Car: 87 iroc-z
Engine: 454
Transmission: th350
Axle/Gears: 3.73
Re: To Raise or to Lower
heres a way to raise or lower your car on the cheap.
http://www.autozone.com/autozone/acc...questid=584456
http://www.autozone.com/autozone/acc...questid=584456
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
heres a way to raise or lower your car on the cheap.
http://www.autozone.com/autozone/acc...questid=584456
http://www.autozone.com/autozone/acc...questid=584456
Thanks Joe but those things are just plain BAD! Won't use them ever. Have you ever seen what they do to a spring over time
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
Looks like the new lower isolators are just shy of 1/4 inch.

Lower Isolator mounted on axle. Fit perfect.

Overall heighth of the upper isolators, stock 3rd gen right about 1.5 inches. Anyone got a 4th gen upper to measure?

Overall, the rear went from 27.5 at the wheel lip to 26.5. This is with car unloaded (no junk in the trunk) and a full tank of gas. This did level it out. I will ride like this for a bit and if I need to raise it a bit more may be someone can chime in with a measurement of the 4th gen upper Isolator.

Lower Isolator mounted on axle. Fit perfect.

Overall heighth of the upper isolators, stock 3rd gen right about 1.5 inches. Anyone got a 4th gen upper to measure?

Overall, the rear went from 27.5 at the wheel lip to 26.5. This is with car unloaded (no junk in the trunk) and a full tank of gas. This did level it out. I will ride like this for a bit and if I need to raise it a bit more may be someone can chime in with a measurement of the 4th gen upper Isolator.
Last edited by jazzdadss; Jul 26, 2013 at 03:55 PM. Reason: Editing.
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
OK, finaly had some time to do some research on this. The part # for the upper spring isolator is the same # from 1982-2002. 3rd and 4th gen F-bodies use the same one so there is no difference in heigth. Guess I will be putting the factory rear springs back in and trying some new V6 springs in the front. We'll see if this makes it sit right.
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Joined: Apr 2011
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From: Huntsville, AL
Car: 89 Black IROC-Z convertible
Engine: 305 TBI
Transmission: Auto
Re: To Raise or to Lower
How about air shocks? I have them on my El Camino and they maintain whatever amount of air that I put into them. Just a thought.
Joined: May 2007
Posts: 2,340
Likes: 2
From: Montreal, Canada
Car: 1986 Chevrolet Camaro IROC-Z28
Engine: TPI 310ci (LB9)
Transmission: Custom Rebuilt 700R4 - 2600 Stall
Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip
Re: To Raise or to Lower
Hmmm.. How come they never put a lower isolator from the factory..?
It would appear that it would reduce the metal to metal contact on the axle and spring, and maybe on the a-arm to spring as well.
It would appear that it would reduce the metal to metal contact on the axle and spring, and maybe on the a-arm to spring as well. Junior Member
Joined: May 2010
Posts: 9
Likes: 0
From: Gulfport, Mississippi
Car: 88 Camaro Sport Coupe
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: To Raise or to Lower
It'll cost a lot more but if got adjustable coil-overs for the rear you could easily set it where you want it.
Thread Starter
Senior Member

Joined: Dec 2009
Posts: 702
Likes: 4
From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: To Raise or to Lower
Saddly I think we are gonna just pick it back up. I put the factory coils back in the rear and Will try V6 front springs. I just dont like the ride charactoristics with it lowered.....
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