Sway Bar GP - add-on for Sedan Combo - Chevy Impala SS Forum
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post #1 of 3 (permalink) Old 05-09-2011, 02:50 PM Thread Starter
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Sway Bar GP - add-on for Sedan Combo

In case it wasn't noticed in the wagon bar GP updates, a small run of SEDAN rear bars in 1-5/16" will be produced at the same time as the wagon bar GP is being produced.

The sedan rear bar will not be sold separately--only as a combination with the 1-3/8" front bar, $499 delivered price in the 48 states.

Several of you had inquired about a sedan rear bar or package--there's the deal, best I can do (sorry, no sedan Super bar).....first come, first served until they're gone. One of five combos is already spoken for, so that leaves four (4) available.

Bill Harper
ISSCA #127
[email protected]

Last edited by Navy Lifer; 05-09-2011 at 03:39 PM.
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post #2 of 3 (permalink) Old 05-29-2011, 09:22 PM
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How does the swaybar size compare to what is currently on the ss? How will it affect the handling (more neutral, more understeer, more oversteer)?

Do the bars come with the urethane bushings and mounting hardware, or is that extra?

Thanks for any info you can share.

1996 DGGM Impala SS - only 8,600 miles - SS # 32,465 of 41,941 for 1996 (1 of 10,676 DGGM cars for 1996)
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post #3 of 3 (permalink) Old 05-30-2011, 10:45 PM Thread Starter
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30mm - OE
35mm - GP - 17% larger

26mm - OE
33.4mm - GP - >28% larger

The OE (production) bars were used on a number of vehicles with different tire/wheel combinations, springs, and shock calibrations--any 91-96 Chevy sedan with F/R bars as part of the suspension RPO used the same bar set. This bar combination is fairly tame, and tends to provide a relatively "understeering" combination, with the rear bar helping to reduce body roll.

Compared to the OE bars (and assuming the OE springs are still being used F/R), the GP sedan bar package will move the handling balance more toward neutral to slight oversteer, depending on the wheel/tire used--Impala SS wheel/tire might exhibit LESS oversteer at the limit than a smaller wheel/tire, since the greater roll resistance with the larger rear bar could more easily overcome a smaller, narrower tire's traction limits.

The larger bars also reduce total body roll more than the OE bars, which helps keep the front tires planted with less positive camber gain, thus the tires work better. There are other variables, some which could negate what I just stated about the Impala SS wheel/tire, and it could be a long discussion to sort through them all--tire pressure, alignment, F/R weight, fuel load, road surface, traction limiters (moisture, oil, etc) and so on--to name a few.

Bars do come with all installation hardware--rear GP bar CAN work on stock LCA with OE 2nd design mounting hardware. The mounting hardware included with the GP rear bar is mainly for use with aftermarket rear LCA's.

Bill Harper
ISSCA #127
[email protected]

Last edited by Navy Lifer; 05-30-2011 at 10:55 PM.
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