New Sway bars on stock LCA? - Chevy Impala SS Forum
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post #1 of 24 (permalink) Old 09-22-2017, 02:45 PM Thread Starter
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New Sway bars on stock LCA?

Hello everyone. I have read many threads about this and some say we must upgrade the LCA's before installing bigger sway bars. Others say that it is not needed. Can anyone chime in on this topic? I would like to rid the car of some of the body roll, but the car will NEVER be autocrossed or tracked. My SS is just a fine commuter car. I drop the kids off at school and commute to work and get groceries in it. It is a 3rd family car and toy. Must I do the LCA's before adding a bigger front and rear roll bar?
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post #2 of 24 (permalink) Old 09-22-2017, 03:52 PM
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The short answer is no,but new trailing arms do offer benefits of their own. As do replacing the body bushings...

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post #3 of 24 (permalink) Old 09-22-2017, 05:28 PM
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Originally Posted by 96_SS_Boi View Post
... Must I do the LCA's before adding a bigger front and rear roll bar?
As 1slow- states, no. There are no state or federal laws governing it. However, just as you would not try to fire a .357 out of a BB gun it visually appears frightful to be loading the forces of a stout bar against such flimsy stampings. And as also referenced, aftermarket arms (and their upgraded bushings) will curtail lateral movement that jacks with the steering line.

Also to your question, not a real connection between a bigger front bar and rear LCAs as far as I can see. Except that you would not want to add a bigger/better front unless/before doing the back anyway (which is what requires the better arms) unless you want even more understeer than these tubs come with stock.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #4 of 24 (permalink) Old 09-22-2017, 05:55 PM
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If you're not driving, beating the crap out of it, you'll be fine. I've logged over 150k on the 91 with stock arms and the 1 1/2" HO bar. Only failure was one side from rust a couple years ago of the bracket that goes inside the arm. My driving is just like you described.

Last edited by 91ss; 09-22-2017 at 07:53 PM.
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post #5 of 24 (permalink) Old 09-22-2017, 07:44 PM Thread Starter
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Quote:
Originally Posted by 96_SS_Boi View Post
... Must I do the LCA's before adding a bigger front and rear roll bar?
As 1slow- states, no. There are no state or federal laws governing it. However, just as you would not try to fire a .357 out of a BB gun it visually appears frightful to be loading the forces of a stout bar against such flimsy stampings. And as also referenced, aftermarket arms (and their upgraded bushings) will curtail lateral movement that jacks with the steering line.

Also to your question, not a real connection between a bigger front bar and rear LCAs as far as I can see. Except that you would not want to add a bigger/better front unless/before doing the back anyway (which is what requires the better arms) unless you want even more understeer than these tubs come with stock.
Thank you very much. I appreciate your response. The longer LCA's will center my wheels too, right?

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If you're not driving, beating the crap out of it, you'll be fine. I've logged over 150k on the 91 with stock arms and the 1 1/2" HO bar. Only failure was one side from rust a couple years of the bracket that goes inside the arm. My driving is just like you described.
Thanks for the comment. My car is thankfully rust free so I should be good. I'll change the LCA's soon, but not now. I gotta get some bars tho. This fat girl leans too much. Up and down movements are surprisingly controlled. Side to side is another story. My new SRT has no lean, roll or pitch. None. At all. It's different driving this SS, but I respect its heritage and old school charm. It's legendary Americana.

But theoretically speaking, if a stock LCA failed while I was driving on the freeway, would I die? Lololol. Seriously. Would I? What would happen? Thanks to everyone for the replies. I'm learning a lot here.

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post #6 of 24 (permalink) Old 09-22-2017, 07:58 PM
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Be careful... I snapped one of the factory LCA with a HO 1.5" bar on my car. I was pulling into a parking lot taking the angled driveway at a slant and the twisting of the car as I pulled in snapped the lower control arm in half. Was about 200 miles into the new sway bar... If you never twist the frame you MAY be OK.. But you certainly don't want to do like I did and snap that sucker. Your getting a tow bill home for that one...

Make sure you get ones designed to be used with the larger sway bar if you go that route. And yes longer ones will center the rear tire but you also need adjustable uppers when you do it so you can adjust the pinion angle to the correct angle otherwise your axle won't be lined up and you will tear up the u-joints quickly.
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post #7 of 24 (permalink) Old 09-22-2017, 11:00 PM Thread Starter
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Be careful... I snapped one of the factory LCA with a HO 1.5" bar on my car. I was pulling into a parking lot taking the angled driveway at a slant and the twisting of the car as I pulled in snapped the lower control arm in half. Was about 200 miles into the new sway bar... If you never twist the frame you MAY be OK.. But you certainly don't want to do like I did and snap that sucker. Your getting a tow bill home for that one...

Make sure you get ones designed to be used with the larger sway bar if you go that route. And yes longer ones will center the rear tire but you also need adjustable uppers when you do it so you can adjust the pinion angle to the correct angle otherwise your axle won't be lined up and you will tear up the u-joints quickly.
Damn. So I need Upper and Lower LCA's? That's more $$$$$. I promised myself I wouldn't mod this car but that's not working well for me. Ok, do you suggest any specific brand that may come in a set at a reasonable price? I gotta get rid of the body roll, then I'll stop modding. I promise.

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post #8 of 24 (permalink) Old 09-23-2017, 07:09 AM
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Damn. So I need Upper and Lower LCA's? That's more $$$$$. I promised myself I wouldn't mod this car but that's not working well for me. Ok, do you suggest any specific brand that may come in a set at a reasonable price? I gotta get rid of the body roll, then I'll stop modding. I promise.
I didn't catch what you're driving, but extendeds are not used on Fleetwoods, and I'm not certain of RMS. And yes, they need to be installed as a set of uppers and lowers for the reason stated. I know of no reasonably priced new sets, and would hold out for something used FS. While likely still not floating around, do a little research on one or two brands 10 years ago that had poor quality materials or early QC issues.

And you MAY or may not have to change out the axle bushings to fit the new uppers. DO NOT use urethane upper bushings = search 'torsional bind'. 'TsallIgot.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #9 of 24 (permalink) Old 09-23-2017, 09:31 AM
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A set of decent shocks (like Bilsteins),and a quality set of spring will reduce "body roll" more than new trailing arms ever will. All trailing arms do (other than locate the rear housing) is limit it's movement from side,to side. Extended length arms are strictly for looks,and offer no advantages over a stock length of comparable construction.

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post #10 of 24 (permalink) Old 09-23-2017, 10:10 AM
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Quote:
Originally Posted by 96_SS_Boi View Post
Damn. So I need Upper and Lower LCA's? That's more $$$$$. I promised myself I wouldn't mod this car but that's not working well for me. Ok, do you suggest any specific brand that may come in a set at a reasonable price? I gotta get rid of the body roll, then I'll stop modding. I promise.
Then too, with extended rear arms I'm sure you will need an extended drive shaft. More $$$$$. But, if you don't mind. Why should I? Just something to think about .

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