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Discussion Starter #1
I've got a 94 Caprice 9C1 with factory sway bar. What size is the bar? Looking to order some sway bar bushings today and thinking of going with the readable poly's but not sure on the bar diameter.
 

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I don't know the exact dimensions, but someone else might. In the meantime, you can go out and wrap a piece of string around the bar, and mark it where the string makes a complete loop. Lay the string out on a table and measure from the end of the string to the mark. Divide by 3.14. That's the diameter.
 

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I have been trying for months to figure out what size the front sway bar is in my 95 wagon.

Yes, I know I can measure it, but it seems insane to me that this information is so difficult to find.
 

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Discussion Starter #6
Sweet deal. At work so didn't want to put off ordering any longer.

I probably should put a bigger bar on but not a lot of time to research right now.
 

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I believe the stock Front Bar is 30mm but unless you have solid history on the car it's possible it was swapped so measure to be sure. But both the Impala SS Frequently Asked Questions doc and the Impala SS FAQ doc have info and data in there you may find helpful.

Impala SS Frequently Asked Questions List

Just scroll til you find what you're looking for. Here is the text from that doc on the Sway bars....


Back to the index...
Anti-Roll Bar Replacement


Q: Can I reduce body-roll on the Impala some how?
A: The stock anti-roll bars for the Chevy B-bodies are all the same at 30mm front, 26mm rear, both solid. Those are standard on the Impala and 9C1, and are optional on the Caprice with the B4U suspension required with an LT1.
Herb Adams makes larger front and rear anti-sway bars: front bar is 33mm (vs. 30mm stock) and rear bar is 38mm (vs. 26mm stock). The front bar is attached to the stock control arm hole via solid tierod ends, and has absolutely no rubber or even urethane bushings, so its effect is immediate. The tierods have grease fittings, which allows them to be lubed along with the steerign linkage so there is no noise or wear. The front bars are attached to the vehicle frame via 36mm factory rubber bushings with fiberglass linings as used on '85-'92 F-cars. These bushings are very stiff and do not squeak, unlike aftermarket urethane ones. The rear bar attaches to the lower control arms using longer grade 8 stainless steel bolts in the stock control arm brackets. You can get the rear bar from Summit racing (216-630-0200) under the Herb Adams/Moroso name, part number MOR-86516 ('77-up B-car, cost $119). Call Herb Adams at (408)-649-8423 and ask them for the '77-up B-car front bar with tie-rod ends. See the installation instructions in the technical archives.
Hotchkis Performance recently introduced a custom set of sway bars for the Impala SS. The bars are lighter than stock: a hollow 1 7/16" front and a 1 1/4" solid rear contoured to the rear end. They have fluted polyurethane bushings with grease fittings, plated heavy duty brackets, polyurethane end links with heavy duty hardware, ultra smooth sway bar finish with gloss black powdercoating and they come complete ready to bolt on. As for performance, Hotchkis claims 7.8 mph faster through the 600' slalom test, crisp turn in, balanced handling and excellent ride comfort while cruising. They are available for around $450 or less through NAISSO.
Also note that a second generation F-body sway bar will work on the front of an Impala. The bar is from the 71-81 F-body, and is primarily fitted to Trans Ams and Z-28's. It is 1 1/4 in. (32 mm) in dia. and 35% stiffer than the stock SS bar. It is avialable in 2 ways: from GM as p/n 356534 (most common price quoted locally was $94.12), or from the local junkyard for $20-40. The best sources at the seem to be the '78 and '79 TA's and Z-28's. You won't need the end links or bushings, just the bar. The stock end links work very well. You'll need bar bushings, (2 are required) (Old PN 26039956, New PN 10288551), Sway Bar (PN 356534), Bolts (4) (PN 15959689), and End bushings (8) (PN 10221801).
Another (even cheaper) upgrade is to replace the factory Impala bushings with the much better urethane bushings from a 4th gen. F-car. These are available under p/n 10221801 and cost a whopping $0.68 each, for a total of $5.44 for all 8 that you will need. These have a specially designed recessed cup that retains the large washer and does not allow the bushing to skew sideways or become cocked like the factory bushings. The urethane material also seems to be of a higher grade. Aftermarket bushing kits are also available. This is a good "bang for the buck" mod for any Impala: the stock Impala bushings are very weak. Another tip is to Replace the rubber frame bushings with GM p/n 26039956 (newer part # is 10288551: current F-body hardware) or aftermarket urethane bushings for 1 1/4 in. sway bars. The GM parts have a fiberglass liner that prevents noise and wear. If you use aftermarket urethane bushings, lube them with 3M Silicone Paste. Do not reuse the "prevailing torque" bolts that hold the front bushings to the frame. Use GM p/n 15959689 (4 needed @ $.42 ea.) as a replacement. The original bolts are likely to strip the threads in the frame if reused.


I currently run the 70-81 Fbody bar which is a little larger (32mm I think) but also have a Herb Adams bar with Tie rod End Links I picked up years ago and never installed. The Technical Archives talks about this bar and may also provide you some more details. Check it out and see if it helps or gives you other things you may want to try.....

Impala SS Technical Archives
 

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Discussion Starter #8
Ordered the ones gbhs72 suggested. It's the stock bar, bought it from the municipality 17 years ago. Thanks guys.
 
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