Rear spring recommendations
Thread Starter
Joined: May 2012
Posts: 437
Likes: 115
From: Arcadia, OK
Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
Rear spring recommendations
Installed the Vogtland lowering springs and while the front is great, the rear would sit about even with the front and was too soft. Even with my KYB AGX shocks set as firm as possible, they allow too much rear suspension travel and feel too soft. I put the OEM rear springs back in with the isolators replaced by heater hose and the ride is perfect, but now sits a full inch higher in the back. Looking at the BMR rear lowering springs (supposedly 1.25 inch lower) to get closer to even height front-to-back with somewhat stock feel but thought I'd ask the forum if they have any experience with any particular rear spring.
Last edited by rt66er; Dec 23, 2019 at 07:20 AM.
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Joined: Apr 2010
Posts: 1,198
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From: Armstrong B.C.
Car: 1991 camaro Z28
Engine: Forged 370" LS turbo s488
Transmission: Built 4L80e FTI converter
Axle/Gears: MWC 9" 35 spline 3.25 gears
Re: Rear spring recommendations
Installed the Vogtland lowering springs and while the front is great, the rear would sit about even with the front and was too soft. Even with my KYB AGX shocks set as firm as possible, they allow too much rear suspension travel and feel too soft. I put the OEM rear springs back in with the isolators replaced by heater hose and the ride is perfect, but now sits a full inch higher in the back. Looking at the BMR rear lowering springs (supposedly 1.25 inch lower) too get closer to even height front-to-back with somewhat stock feel but thought I'd ask the forum if they have any experience with any particular rear spring.
Joined: Mar 2001
Posts: 10,405
Likes: 2,081
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Rear spring recommendations
As much as you're fiddling with this, I'd just get a set of rear weight jacks and stop hassling with ride height. After you have the weight jacks you can buy different springs in 50 lb/in increments. But usually ride quality comes down to needing different shocks, not so much the springs.
I think UMI sells the rear weight jacks individually. Ground Control won't sell you just the rear set, last time I checked. Not sure whether or not Detroit Speed has rear sets.
I think UMI sells the rear weight jacks individually. Ground Control won't sell you just the rear set, last time I checked. Not sure whether or not Detroit Speed has rear sets.
Thread Starter
Joined: May 2012
Posts: 437
Likes: 115
From: Arcadia, OK
Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
Re: Rear spring recommendations
Thanks, guys. I was mistaken when I said I had the shocks set full firm. They were at "5" out of "8". I have re-installed the Vogtland springs with an extra 1/4-inch rubber bushing on top (in addition to the OEM spring pad) and set the shocks on "8" to see how that works. I'd like the back to be just a bit higher than the front (1/4- to 1/2-inch) so I may try a set of 4th gen rear isolator pads if this isn't where I want it. Weight jacks would be the obvious choice here, for sure, if I wasn't so cheap.
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