Can someone please tell me what is different between rear isolator P/N 10037104 and 10037105?

I also measured my rear sway bar and it's a tad over 23 mm. I cleaned it off pretty good and got the same result. I used a clamp and gently snugged it over a straight section, then measured the gap. Did the same thing on the front and got 34 mm, so I know the method is sound. Is a slightly undersize 23mm+ mm size typical of "24mm" sway bars?

I have an '88 Iroc LB9 5spd.

Thanks!

 

Rear isloators? Are you talking rear sway bar bushings? If you are then I would suppose that one is a poly bushing and the other is a rubber oem type bushing. If you measured the rear sway bar with a digital caliper gauge and it measured ~23 mm then it is 23 mm. My '86 rear sway bar measured 23 mm and Energy Suspensions 23 mm poly bushings fit perfect. The front on my Camaro is also 36 (edit) mm like yours.

 

Yes, they are the bushings! Sorry, was using terminology on some GM parts sights I’ve visited….I’ve also seen “insulator”. I'm looking for the OE bushing for my car. From my initial search I’ve seen a few references to a 23 mm bar (see TGO links below). I’ve confirmed these p/n based on the many helpful threads in TGO:

21 mm sway bar p/n 10021221
24 mm sway bar p/n 10035033

But, nowhere have I been able to find a p/n for a 23 mm sway bar. Does anyone out there have a GM P/N for a 23 mm rear sway bar and matching OE bushings?

One possibility is that these are actually 24 mm bars at the low end of the manufacturing tolerance, but seems a stretch since O.D. tolerance on bar stock should be better than +/- 1 mm!

Maybe 10037104 and 10037105 are both 24 mm non-poly bushings, but one is higher durometer than the other, say for the 1LE?? (only 4 made in 1988 as I understand).

Any help from some of you 3rd Gen veterans out there would be greatly appreciated!



https://www.thirdgen.org/forums/suspension-chassis/630330-rear-sway-bars.html
https://www.thirdgen.org/forums/faq-board/59687-questions-answered-sway-bar.html
https://www.thirdgen.org/forums/suspension-chassis/506651-swaybar-question.html

This link references the 24 mm sway bar in section 7.000:
http://www.austinthirdgen.org/parts/html/7-02.htm

 

Z23 Z28,
BTW, thanks for the photo. Are those Bilstien shocks a direct OE Delco-Bilstein replacement?

 

In the first link, ZZ3, you mention the following:

"To add to the mix, my 1986 Z has a factory 34/24 set up. Confirmed with a digital caliper gauge."

Curious, is this a different car or a different bar?

In attempting to solve the conundrum, I find that you also mention you "have a 1986 Z with a factory rear sway bar size of 23 mm measured with a digital caliper gauge. The front sway bar measures 36 mm."

Since research (and we all know what goofiness that can cause) says that the 36 mm bar didn't arrive until 89 in Camaros, I wonder if there's a possibility the bar was swapped in at some point.

EDIT: Should anyone know why some IROC's were equipped with the 24 rear and others with a 23, an explanation would be much appreciated. Softer springs, bigger bars. Smaller bars, stiffer springs. I wonder if the 24 vs 23 issue would call for different springs? Sorry about the off-topic concerns. If you have an answer, please PM me.

JamesC

 

Holy freakin' c**p, did I make a mistake in the top post. Yes it is 23 mm for the rear sway bar not 24 mm, that has to be a typo that I will edit pronto. I am sorry for the cofusion and if I would have reread my own post I would have caught that. Gonna have to remeasure the front again to be safe.

The rear shocks are Bilstein B8s, 24-010214, that I am sure of.

 

Okay to clear up any questions the front sway bar is 34 mm. Proof attached. Both sway bars front and rear are original to the car.

 

JamesC

 

ZZ3 Z28,

Okay, I think we would all agree that if you measured your rear sway bar with the same device in your photo and got 23 and some change (assuming you zeroed it out first), then I'd be fairly convinced about the exisitance of 23 mm sway bars.

The questions still stand to the TGO crowd:

Anyone know the P/N to the 23 mm bar and matching bushings?

and........

What's different between bushing 10037104 and 10037105?

Thanks!

 

Found this thread here at TGO dated 5-31-2002 concerning the two part numbers.


24mm = 10037105

23mm = 10037104

https://www.thirdgen.org/forums/susp...-bushings.html

There is irrefutable evidence of 23 mm rear sway bars on third gen Camaros. If there weren't 23 mm sway bars then why does Energy Suspensions sell 23 mm sway bar bushings part # 3.5146 for 1982-2002 Camaros?

 

10037105
-10037104
1 Camero puts tighter springs and smaller anti-sway bars pontiac uses softer springs, and larger anti-sway bars if you combine the two you get better handling tighter springs-bigger anti-sway bar rougher ride, but you can corner even better. sorry about the math thing I couldn't help it.

 

Interesting. I replaced my 24mm bushing from GM a few years ago, part number 10037104, according to my records. Should the 23mm bushing be 10037105, the number is good at GMParts Direct.

JamesC

 

Actually they don't... Both the Camaro and the Firebird use the same springs, you can check the codes and part numbers.

 

Stopped at a local Chevy dealer on my way home from work to see what additional info I could gather on this topic. Shown below is a search for rear sway bar bushing. Sorry, don’t remember his exact search criteria. I think it was bushings/1988/Camaro. Description of 10037104 shows FE2, 23MM Shaft Diam (assuming not an error!). Not sure why 10037105 not showing. I was dealing with the parts manager and he was not able to find P/N for 23 mm sway bar, but will let me know what he finds after more searching.

 

Curiouser and curiouser, said Alice. A moment ago, I double-checked my rear bar with a digital caliper, thinking that perhaps I'd been incorrect all this time, but the bar measured 24. Hopefully, you'll get to the bottom of this issue.

Good luck in your quest.

EDIT 1: Perhaps the following cross reference will be helpful in some manner:

http://c2c.activant.com/ctoc/index.j...JAXlA6fFIPX3cf

EDIT 2: The AC Delco link times out, so the pertinent info is below:

45G0548 is .94, which is a 24 mm.
45G0549 is for BOTH the .83 (a 21 mm) and a .91 (a 23 mm)

EDIT 3: Raybestos 5501048 is .94.
5501049 for BOTH .83 (a 21) or .91 (a 23).

Napa shows the same distinction as above:

NCP 2652010 .94 bar diameter
NCP 2652011 .83 or .91 bar diameter

JamesC

 

The following bits are from my 82-85 Parts and Illustration Cat.:

BUSHING-INSULATOR-SHAFT, Stabilizer Shaft

82-84 W/Z28 10037104 INSULATOR, RR STAB SHF (21 mm Bar)

85 W/Z28, ZK3 (EXC TOURING SUSP FE2) 10037104 INSULATOR, RR STAB SHF (23 mm Bar)

The above may explain the AC Delco, Raybestos, Napa 21/23 business.

BTW, nowhere does the cat. mention the 24 mm bar in my 85, though it does mention the 34 mm front bar.

JamesC

 

They used the same basic parts, but the firebirds tended to get a more aggressive tune (proportionately stiffer rear suspension which would be more neutral/less understeer) than camaros.

 

The springs used in the FE2 Camaro and FE2 (WS6) Firebird are the exact same springs. Same part number, same broadcast codes, identical. It's true that Chevy and Pontiac approached the suspension in different ways, catering to their own needs, but it's false that the springs are in any way different.

 

So you are confirming that a 23 mm rear sway bar exists? That's good because I have one on my 1986 Z28.

 

Reference – Go here:
https://www.thirdgen.org/forums/suspension-chassis/630330-rear-sway-bars.html#post5092813

Great info James C, thank you! Two things I noted:

1) p/n 10037104 is shown as bushing for 21 mm and 23 mm bar, but no 23 mm bar listed!
2) p/n 10035033 bar shown as rear FE2 for 1985 without O.D. size

I don't think 10035033 is the mysterious missing 23 mm bar, and I tend to agree with your comment in the other thread that 10035033 is 24mm, but you never know. Regarding your comment above “BTW, nowhere does the cat. mention the 24 mm bar in my 85”, I’m thinking the 10035033 listed w/o size is your RR sway bar. (as I’m sure you probably concluded).

The attached files from Austin Third Gen show 10035033 & 10037105 together. Not sure what catalog this is from since data arranged differently than your catalog, but is newer and perhaps GM updated how data is presented? I don’t trust it as complete since it only shows the largest RR sway bar (maybe only for FE2).

At this point, I’m fairly confident that the 10037104 bushing is the one that mates to my 23mm RR sway bar, but as a curiosity, I want to find p/n to the 23mm sway bar. Having surfed other forums and just Googling, there’s no question a 23mm bar exists, and is in fact quite common. Just puzzled that for such a common RR sway bar there’s no record of it. Hopefully, someone with a newer GM parts catalog from 86-92 years can come forward and solve this puzzle!

 

Resuming my Camaro project after several months of other priorities.......

In the meantime, I purchased a 1988 Chevrolet "F" Parts and Illustration Catalog (Sept '87) and it shows that FE2 & F41 use RR sway 10021221 listed as a 21 mm shaft in section 7.241 - SHAFT, Stabilizer. However, further below in section 7.243 - INSULATOR, Stabilizer shaft, there is a 10037104 insulator for FE2 & F41 listed as 23 mm (No insulator showing for a 21 mm shaft)

From this I conclude that 10021221 - 21 mm shaft is an error, and should really be a 23 mm shaft. This would explain the mystery of the existence of a 23mm shaft (verified by several folks) for which there is no GM part number.

Additionally, the ’82-’88 “F” catalog shows Insulator 10037104 as 21 mm for 82-84, then 23 mm for 85-86 and 87-89. Go Here: http://www.gmpartswiki.com/getpage?pageid=37831

10021221 either started out as 21 mm and changed to 23 mm beginning in ’85 while keeping same p/n (unlikely), or was always 23mm and showing as 21 mm in error in several catalogs (possible).

Can anyone confirm if they have an original GM 21mm rear sway bar on their 3rd Gen Camaro?

Thanks

 

My understanding is that tons of lower optioned cars had the 21mm rear bar. More info here:

https://www.thirdgen.org/forums/faq-...-sway-bar.html

 

With the help of the folks at AC Delco, was finally able to get some info on the elusive 23 mm rear sway bar. Below are sections of the original GM blueprints for rear sway bars and bushings (this is all I could get). Each drawing is a chart containing all related part numbers. The 23 mm sway bar is P/N 10029260. The matching bushing is Item #2, or 10037104. The person helping me stated 10029260 is from 1988 – 1991 and shows as superseded by 21 mm bar 10021221 in Delco’s internal parts system. No explanation given.

I searched a handful NOS part sites and other Camaro forums and there’s no mention of 10029260. I conclude this is a error in GM’s P/N system that began when the 23 mm bar began in 1988.

Yes, a 23 mm bar does exist, but with a ghost P/N. Maybe some of the NOS #10021221 bars floating around on the web are actually 23 mm?