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

Altered Suspension Geometry Spring Rates

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Old Sep 12, 2020 | 05:40 PM
  #1  
midnightfirews6's Avatar
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From: Evansville, IN
Car: 1984 Trans Am WS6
Engine: LG4
Transmission: T56
Axle/Gears: 3.23 LSD
Altered Suspension Geometry Spring Rates

Those who've lowered your panhard bar:

what spring rates and sway bars are you running?:
are you stock geometry in the front, or on extended ball joints or drop spindles?:
coilovers ​​​​​or stock style config?:
sbc/bbc/ls- iron or aluminum block/heads?:
auto trans or manual?:
autox/ hpde/ tt/ road race/ drift/ street, and experience, licensing or accolades?:

1050#/F now, trying to figure out a rough ballpark to start with for rears. I know 5:1 is typical for stock geometry, not sure where to begin with this. Thought this could be a useful thread for those wandering away from the general's roll center placement.
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Old Sep 12, 2020 | 05:59 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: Altered Suspension Geometry Spring Rates

I use 1050lb fronts with tall joints and a bit lowered. 250 rears with a dropped panhard. 36mm front bar, 19mm rear. Koni yellows
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Old Sep 15, 2020 | 11:39 PM
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From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Re: Altered Suspension Geometry Spring Rates

Originally Posted by //<86TA>\\
I use 1050lb fronts with tall joints and a bit lowered. 250 rears with a dropped panhard. 36mm front bar, 19mm rear. Koni yellows
I use #900 11" front with 1/2" ext BJ and 2" Drop Spindles a bit lowered (alum rad, LS2: WJ's, alum hubs, 2 pc 13" rotors, 6pot WW FSL calipers, tubular a-arms). #250 rears with axle side dropped panhard. 36 mm front bar, 19mm rear. Koni yellow front struts and RideTech rear coilovers w/12 bolt. Hyperco fore and aft.
11" #900 Hyperco is #1 lighter than Eibach #850 9.5".

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Old Sep 20, 2020 | 05:18 PM
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Car: 1988 IROCZ
Engine: ZZ4
Transmission: T-56
Axle/Gears: MOSER 9"
Re: Altered Suspension Geometry Spring Rates

*double post

Last edited by rurnt88; Sep 20, 2020 at 05:25 PM.
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Old Sep 20, 2020 | 05:22 PM
  #5  
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From: USA
Car: 1988 IROCZ
Engine: ZZ4
Transmission: T-56
Axle/Gears: MOSER 9"
Re: Altered Suspension Geometry Spring Rates

Hey TEDS, With your weight-jacks, what did you use for isolators on the front?
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Old Sep 20, 2020 | 09:08 PM
  #6  
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From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Re: Altered Suspension Geometry Spring Rates

It's just heater hose split open and zip tied as in the pic, a little grease added too. Works fine.
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