I don't know how the tables will come out, but here goes. Using this info I have finally gathered ... wonder bar 36mm hollow front swaybar 34mm rear swaybar (may be 25mm it is on the way) BZX front springs NNL rear springs By the way can anyone give me part numbers for high duromete 24mm rear swaybar bushings, or any other high durometer 1LE type bushings for that matter. Q: Does anyone know where I can get a new “Wonderbar”? Does it help much? A: It was worth putting on. Definetly made a noticeable difference. Here are the part numbers. _Part_No.____________Description________________Price________Prices are from www.gmpartsdirect.com GM (14079634) Brace Assembly “Wonderbar” $19.53 (The GM price is $45.77) Known Factory Wonder Bar / Sway Bar / Spring Combinations Wonder Sway Bar Springs Car__________Bar?___Front_________Rear_________Front_________Rear______ 85 IROC Yes 32mm solid 86 IROC Yes 34mm front 24mm rear 87 IROC - wonder bar, 36mm hollow ??mm rear 6ZW,7ZW 8NL,9NL, 88 SCV8AT No 30mm solid 18mm solid 6XW,7XW 8UX,9UX Sway Bar Sizes (listed stiff to soft) FRONT SWAY BARS 36mm hollow (rare), 34mm solid, 34mm hollow, 32mm solid, 30mm solid, 28mm solid (Rumor has it that 36mm hollow bars were offered in 89-92 Camaros, and 86-92 Firebirds)) REAR SWAY BARS 25mm solid (rare), 24 mm solid, 23mm solid, 21mm solid, 18mm solid, 12mm solid Q: Does anyone know the part number for the hollow 36mm swaybar? A: Here is the part number. _Part_No.____________Description________________Price________Prices are from www.gmpartsdirect.com GM (14094344) 36mm Hollow Swaybar (1LE) $65.22 each GM(14094389) 36mm swaybar high durometer bushing Q: Does anyone know where I can get new rubber or polyurethane rear spring islators? A: Here are the part numbers. _Part_No.____________Description________________Price________Prices are from www.gmpartsdirect.com GM (14047915) Front Coil Spring Isolator $3.86 each GM (10290379) Rear Coil Spring Isolator $5.84 each Spring Rates The stock 3rd gen front coil spring rates are around 350lbs/in for base cars, and around 548 lbs/in for IROC-Z /WS6 cars, 4th gen WS6 cars are around 360lbs/in.The stock rear coil spring rates are around 204lbs for IROC-Z /WS6 cars On springs, the last 2 characters are the rate. (Rumor has it that IROC "BZX" front springs are 3" shorter than stock '82 springs) Front Springs “XX" is the lightest, and "ZZ" is the heaviest) 6ZW&7ZW springs are the highest sping rate The stiffest 4 springs ( ZW, ZX ,ZY ,and ZZ ) are all replaced by a single part # GM(14029399) Possible front springs for a 87 RS w/F41 Suspension or a 87 Z8 w/ FE2 Suspension Part No. Tag Part No. ------------------------------------------- 14029399 BZY 14029399 -------------- (+) Highest load rate 14029398 BZX 14029398 14029397 BZW 14029398* 14029396 CDB 14029396 14029395 BXY 14029396* 14029396 BXX 14029396*-------------- (-) Lowest load rate ------------------------------------------- Rear Springs ("UZ" is the lightest, and "NB" is the heaviest) The stiffest two springs NNM & NNB are only used on the FE2 & F41 suspensions. 67 RS w/F41 susp 87 Z28 w/FE2 susp Prod# Code Service # Possible rear springs for a 87 RS w/F41 Suspension or a 87 Z8 w/ FE2 Suspension Part No. Tag Part No. ------------------------------------------- 10018083 NNB 10018092*-------------- (+) Highest load rate 10018092 NNM 10018092 10018091 NNL 10018091 10018093 NNN 10018091 10032969 NYB 10018091 -------------- (-) Lowest load rate ------------------------------------------- WS6 Suspension Parts The WS6 front springs are code-BZX GM(14029398). The Moog part no for the WS6 front springs is Moog(CS-5665). The rear springs either come in single rate or variable rate styles.The original GM rear springs came only in a single rate style on WS6 equipped F-bodies. The Moog part no for the (single-rate) rear coil is Moog(CS-5662). Q: Does anyone know where I can get a new “Wonderbar”? Does it help much? A: It was worth putting on. Definetly made a noticeable difference. Here are the part numbers. _Part_No.____________Description________________Price________Prices are from www.gmpartsdirect.com GM (14079634) Brace Assembly “Wonderbar” $19.53 (The GM price is $45.77)

The part number for the 1LE higher durometer 24mm bushings is as follows: 10037104. The 1LE poly end links are part number 10221779.

wow, my eyes hurt

wonderbar part number is not working

I believe I've read that the wonderbar is no longer available through GM.

JamesC

back from the dead

does anyone know where NUX rear springs fit in the range? it's an '87 SC, originally lg4 so probably one of the softer ones. i want to know if they'll be as stiff as ws6 springs if i cut them a half coil or so.

I have to thank chitowncruiser for "guiding" me to this post. I also have to thank Mike-88CamaroTBI for posting all this info on suspension. Im STILL kinda lost about what I'm looking into for my 91 Formula. Im looking to redo the suspension top to bottom but Im gonna start small. For front springs for me....what would i want something "light" or "heavy"????? I want something "better " than stock springs but I dont want a "harsh" ride either.

As for the rear springs.....whats the difference between single and variable rate???

My last question (for now ) is will "playing" around with different springs affect a wheel alignment greatly? Granted putting in lowering springs will affect alignments (to SOME degree). But what about switching for a rear spring with a single rate to a spring with variable rate???? Would that affect the alignment a lot?

Thanks.

I recently picked up a wonderbar for my firebird from the olds dealer around the corner.

wow, i love this search button-
thanks Mike-88CamaroTBI,
this was and is very help ful to me to see what kinda springs i have and see how my combo is working,
i have the 36mm hollow front sway bar and 25mm solid rearsway bar
mysprings are the front are BZX an the rear are NNL, this is in a 89 iroc w/ 305tpi/auto/2.73 rear.

Is there a part # for the 25mm solid rear bar? If it is available that is. If not what kind of car should I be looking for at the yard?

i have one on my 89 iroc

I have the hollow 36/solid 24 combo which came on some 89-92 Camaros and some 86 to 92 Firebirds (my 85 IROC originally had a solid 34/solid 24 combo). Frankly, I've never heard of a 25mm rear but that certainly doesn't mean that it doesn't exist. Has anyone actually verified its existance with a micrometer or by some other means?

JamesC

I did not see the following part # in your list above.

On my 1991 Camaro RS. RPO F41
Front Springs (factory originals): 14029392 BXU

I pulled the blue tag off a couple of weeks ago when installing wonder bar. As far as I know the front springs are original. I am the second owner and bought the car w/ 26,xxx miles.

I have one on my Iroc. i tried to fit and squeeze the 24 on there. but i had to get a 1" drill bit and drill it out. and i put claiper on there and looked at the charts for the conversion to metric. when all done and said. Its a 25mm.

holy crap good info i need to find a wonderbar for the 82 t/a now that i think about it, plus get some good replacement springs for it too, etc. now that the LG4 and thm200c are out in favor of a 350 and th350

thanks

Can the 25mm rear be purchased throught GM parts direct or somewhere else to keep me from digging through the yard.It's not that I mind it's just alot of bad road between here and San Jose.

I would be more then happy to find a 25 rear, that way I can go to a 36 front.

Must find part number

Although I've sold a number of the so-called 1LE/WS6 sway bars (36/24 combo), they can be somewhat diffiuclt to find, but finding them is certainly not impossible. I'd be interested in a part # for the 25mm myself since I've never seen one. What is the 25 paired with up front?

JamesC

Sorry James - cutting in a bit I'm afraid - don't have your answer.

To Mike-88CamaroTBI-

Can you tell us a bit about where you got your info - source it for us? Just curious. Very glad to see some spring rate numbers though - been wanting to know what my '89 IROC has, roughly, for spring rates so if I go shopping for others I can objectively compare the new with the stock stuff - thanks.

Kevin

a 36mm hollow sway bar.

as for the waonder bar....gm DOES NOT MAKE IT anymore, but i have come across some complanies that do now, i have a spohn performance adjustable on mine, they have a standard as well, but as everyone knows, allmost anything after market is wayyyy better...the standard one is 60 bucks and the adjustable is 95

Spohns swaybar combo is:

36mm solid front
25mm solid rear

Huh… interesting thread. I may be able to offer some other useful info (actually measured):

Front:
BZX 14029398 ’87 WS6 Formula 611lb/in
BZW 14029398 '83 Trans Am 630lb/in
BXW 14029393 Late RS F41 397lb/in

Rear:
NNL 10018091 '87 WS6 Formula 155lb/in
NNB 10018092 '83 Crossfire TA (didn't measure the rate)

The '87 Formula 350 came with 36/24mm sway bars
The '83 had 32/21 (I really think that these were actually sae sizes since they measure round numbers: 1.25" and .825")

The formula has eibach springs (710/108-170 lb/in) and the 36/24 sway bars on it and the '83 had the '83 fronts with one coil cut (780lb/in) and the rears with ½ a coil cut (195lb/in) with the 32/21mm sway bars. The '87 formula has all poly sway bar bushings, I found that I liked the '83 better with rubber bushings in the back.

I was MUCH happier with the way the '83 handled with the stiffer springs and much softer sway bars, and it was significantly faster at the autox.

I'm trying to find a 34mm hollow front bar (anyone have one collecting dust?). I figure that would be about the same as the 32 solid but weigh less (the 36mm hollow weighs 11#, the 32 solid weighs 33#)