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

Stock sway bar sizes

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Old Jun 16, 2010 | 08:44 PM
  #1  
KILLA85T/A's Avatar
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From: Union City, CA
Car: 1985 Trans Am
Engine: 305 4bbl(not H.O.)
Transmission: T-5
Stock sway bar sizes

Can someone please tell me where i can find stock front and back sway bar sizes for third gen trans am's. I'm thinking about hitting the junkyard to find some, instead of paying a lot for aftermarket bars. Also whats a good combo for my 85 305 5 speed? It's a daily driver but i want to improve the handling when i'm hitting those fast corners! I'd really appriciate any advice.
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Old Jun 16, 2010 | 08:52 PM
  #2  
//<86TA>\\'s Avatar
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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: Stock sway bar sizes

there are many different combos, the largest are 36mm front, 24mm rear. Most people have good luck with this combo, but it has a lot to do with your other suspension parts too, tires, shocks struts, ect ect ect

pick up a cheap digital caliper and measure them before you pull them.
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Old Jun 22, 2010 | 10:47 PM
  #3  
New2Chevy's Avatar
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From: Wyoming
Car: 1995 Formula
Engine: LT1 350
Transmission: Built 4L60e
Axle/Gears: 10 bolt, Eaton posi, 3.73's
Re: Stock sway bar sizes

I just measured mine, and I got a tad over 34 mm on the front and a tad over 24 mm on the rear, and the biggest sizes made by Energy Suspension are 34 mm for the front and 24 mm for the rear, as far as metric sizes.
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Old Jun 23, 2010 | 12:59 AM
  #4  
duckmanquacker's Avatar
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From: Leander,TX
Car: 84 Z28 / 88 Trans Am / 87 base
Engine: L69 H.O. / 468 BBC / 2.8 v6
Transmission: 89 700R4 / TH375B / 700R4
Axle/Gears: 3.73 open / 3.23 posi / 3.42 open
Re: Stock sway bar sizes

IIRC the camaro didn't get the larger 36mm bar until 91. whereas the birds had them as early as 87. The camaro used a heavier spring rate with the 34mm bar.
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Old Jun 23, 2010 | 06:35 AM
  #5  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Stock sway bar sizes

Some Camaros were equipped with the 36/24 combo from 89-92, some 'Birds from 86-92.

The bushing can be purchased from Spohn and TDS:

http://www.spohn.net/shop/1982-1992-...s-Accessories/

http://www.top-downsolutions.com/ind...95a32f7f1aa6b9

JamesC
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Old Jun 23, 2010 | 07:38 AM
  #6  
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From: Raleigh, NC
Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: Stock sway bar sizes

so ive been wondering what are the best sway bar combo..... is the 36/24mm the best or something... can you do better than that... i have poly bushings on my 36/24 combo but is there another combo that could be better.. here is my combo..


SUSPENSION/CHASSIS MODS......
WS6+ suspension
Spohn Front end rebuild kit
J&M Adjustable Strut mounts
KYB GR-2 Front struts
KYB Gas-a-just rear shocks
Moog front 5662 Springs
WS6 rear springs
36mm front sway bar with poly bushings
24mm rear sway bar with poly bushings
Stock painted A arms poly bushings and poly ball joints
new poly front and rear sway bar endlinks
Front K-member Braces
UMI Steering Brace
BMR Strut Tower brace
BMR weld in outer subframe connectors
Alstons weld in Inner subframe connectors
BMR non adjust Torque arm with poly bushing
hotchkis Non adjust Panhard bar with poly bushings
J & M Street non adjust Lower Control Arms
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Old Jun 23, 2010 | 07:42 AM
  #7  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Stock sway bar sizes

Originally Posted by 88fastgta
so ive been wondering what are the best sway bar combo.....
Many road racers experiment with combinations until they find what's best for them and their application.

JamesC
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Old Jun 23, 2010 | 11:07 PM
  #8  
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From: Wyoming
Car: 1995 Formula
Engine: LT1 350
Transmission: Built 4L60e
Axle/Gears: 10 bolt, Eaton posi, 3.73's
Re: Stock sway bar sizes

I think your sway bar thicknesses are just fine, and with all your other mods, your car should be handling like a dream. I would guess thicker sway bars would make the car even stiffer but maybe not enough to justify the expense, especially since you've got your suspension system pretty much done it seems.

Lowering your car (I'm thinking the springs you chose did not lower the car much or at all) and getting adjustable panhard rod and lca relocation brackets would probably be your best improvement, over thicker sway bars.

That's my opinion, since I've always got a very noticeable result from lowering my cars, without any other suspension changes.

Originally Posted by 88fastgta
so ive been wondering what are the best sway bar combo..... is the 36/24mm the best or something... can you do better than that... i have poly bushings on my 36/24 combo but is there another combo that could be better.. here is my combo..


SUSPENSION/CHASSIS MODS......
WS6+ suspension
Spohn Front end rebuild kit
J&M Adjustable Strut mounts
KYB GR-2 Front struts
KYB Gas-a-just rear shocks
Moog front 5662 Springs
WS6 rear springs
36mm front sway bar with poly bushings
24mm rear sway bar with poly bushings
Stock painted A arms poly bushings and poly ball joints
new poly front and rear sway bar endlinks
Front K-member Braces
UMI Steering Brace
BMR Strut Tower brace
BMR weld in outer subframe connectors
Alstons weld in Inner subframe connectors
BMR non adjust Torque arm with poly bushing
hotchkis Non adjust Panhard bar with poly bushings
J & M Street non adjust Lower Control Arms

Last edited by New2Chevy; Jun 23, 2010 at 11:13 PM.
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Old Jun 28, 2010 | 10:27 PM
  #9  
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From: West of Toronto
Car: 89 IROC
Engine: 305 TPI / ZZ4 cam
Transmission: Stage 2 700R4, LS1 driveshaft
Axle/Gears: Strange 3.42 w/ Auburn
Re: Stock sway bar sizes

It also depends what you use your fbody for.

I know someone who was very into road racing and solo courses. He found the 24mm bar made the rear slide too much and switched back to a 19mm.

Find a starting point and see if it suits your needs.
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