Suspension and Chassis Questions about your suspension? Need chassis advice?

Max lowering?

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Old May 27, 2011 | 01:20 AM
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From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Max lowering?

I've seen many threads that talk about lowering 1-2 inches. Has anyone gone lower? 3 or more inches? Apart from the practical difficulty with clearance on regular streets are there technical obstacles? Are parts readily available? On the back it doesn't look like there's much room to relocate stuff up more than about 2 inches.
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Old May 27, 2011 | 05:08 PM
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From: Pepperell, MA
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: Max lowering?

if you did lowering spindles and lowering springs up front, you may be able to get up to 4" of drop, but you'll probably hit every pebble on the road not to mention possible geometry issues. back end, not so sure
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Old May 27, 2011 | 05:24 PM
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Re: Max lowering?

http://www.ridetech.com/

http://www.youtube.com/watch?v=gXdmGQK-w_M

Slam it for shows or what not, raise it for driving. Only way to go IMO if you like it really low. Too much of a practicality issue to have it permanently slammed.
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Old May 27, 2011 | 05:33 PM
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From: Everett, WA
Car: 87' IROC
Engine: L98
Transmission: T56
Re: Max lowering?

This in on the factory rear bump stops and my strut shaft mounted bump stops on the front. You can get lower in the rear by cutting down the rear bump stop. The picture height is totally undriveable (i didn't even try). The radiator airdam is about 1" off the ground.







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Old May 27, 2011 | 05:34 PM
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From: Everett, WA
Car: 87' IROC
Engine: L98
Transmission: T56
Re: Max lowering?

Front 24"


Rear 25"

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Old May 27, 2011 | 06:42 PM
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Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Max lowering?

a little dark, but im at 26ish in the front and 26.5? in the rear? I havent had any issues bottoming out or not being able to get in driveways. Its about as low as i would drive ont he street.
Name:  P1000037.jpg
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Size:  87.0 KB
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Old May 27, 2011 | 07:06 PM
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From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: Max lowering?

I figured more than 2" would get very impractical. I still it to be streetable. I may need to modify the wheel wells at some point unless I can get stiff enough springs so I don't hit the tires. I do like the lowered look and it'll help on the track too. I think having the wheel arch raised to match the contour of the tire when the car is lowered would look really good. Beyond my current skill set but I have a friend who can weld. ???
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Old May 27, 2011 | 08:13 PM
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Re: Max lowering?

Riding on the bumpstops.....I can't think of a more annoying way to drive a car.

I'd say 1.5" is plenty low. Any more than that and those bumpstops will rattle you to death.
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Old May 27, 2011 | 08:51 PM
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From: Everett, WA
Car: 87' IROC
Engine: L98
Transmission: T56
Re: Max lowering?

Originally Posted by Reid Fleming
Riding on the bumpstops.....I can't think of a more annoying way to drive a car.

I'd say 1.5" is plenty low. Any more than that and those bumpstops will rattle you to death.
Well if you are referring to me, then clearly you didn't read my post. How typical.

My final ride height is close to 86's. I'm at 25.75" front and 26" rear. I do not have any trouble driving the car this way. You have to be a bit careful on steep approaches, but no big deal on a weekend car.

//86\\, I have talked to you a lot here but I guess I have never seen your car. Absolutely beautiful. Keep up the good work.

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Old May 27, 2011 | 08:58 PM
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Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Max lowering?

Originally Posted by 87350IROC

one of my favorite pictures

while we are on this lowering topic, question for you. what part number are the front shaft mounted bump stops are you using? the number i found searching is Koni 70-34-53-000-0, but i cant find them in stock anywhere, and last time i checked, they were backordered for a few months on summit???

I dont have issues with the front end bottoming out, but i dont have any bump stops up front and would like to add something.
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Old May 27, 2011 | 09:10 PM
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From: Everett, WA
Car: 87' IROC
Engine: L98
Transmission: T56
Re: Max lowering?

Originally Posted by //<86TA>\\
while we are on this lowering topic, question for you. what part number are the front shaft mounted bump stops are you using? the number i found searching is Koni 70-34-53-000-0, but i cant find them in stock anywhere, and last time i checked, they were backordered for a few months on summit???

I dont have issues with the front end bottoming out, but i dont have any bump stops up front and would like to add something.
I use the Ground Control bump stops on the front struts and stock cut down bump stops on the rear. The Koni's are crazy expensive and hard to find. I use the "soft strut" version.

http://www.ground-control-store.com/...php/II=10/CA=1

The downside to this setup is they are kinda tall. If I had mine off again I'd probably cut 1/2" off the end.
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Old May 27, 2011 | 09:14 PM
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Max lowering?

cool beans, thanks! I was looking, Spohn has some too, but they are the same price (same part?) as the koni's. 52 bux is a bit much for some foam/rubber IMO
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