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Old 05-21-2012, 11:33 AM   #1
J Wikoff
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Default GXP rear sway bar

Does anyone know the diameter of the GXP rear bar? I'd like to order bushings for it and the front bar, but I can't find the rear bar size.
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Old 05-21-2012, 05:25 PM   #2
GOPHERIT
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Rear sway bar for GXP is 20MM (0.78)---FE3 suspension, vs GT bar 18MM (0.70)---FE2 suspension. All models have the same size front bar of 23MM (0.905). At least until modified with the bigger stuff.
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Old 01-27-2013, 07:56 PM   #3
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Is 20mm correct for the rear sway bar size on a gxp? White line only makes poly bushing for the rear in sizes 14mm, 16mm, & 18mm. Their upgraded bar for g8 is 22mm for the rear. So is 20 the correct factory size?? I need to get new bushings an want to make sure I order the correct size. Thanks.
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Old 01-27-2013, 11:10 PM   #4
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^^^ Yes it is. I have one in my car right now and the OEM GT stowed away for now. Took off the 18MM GT and installed the 20MM GXP
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Old 01-28-2013, 12:41 AM   #5
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Default GXP rear sway bar

Ok cause I can't find anyone who makes a 20mm poly bushing for rear for our cars. Can help me out? Yea I've checked whiteline biggest one they sell is 18mm, pedders and bmr don't carry one. I don't know where to search


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Old 01-28-2013, 10:09 AM   #6
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You could go to a GM dealer parts counter *that* sold Pontiac's (or one that continues to sell Buick/Cadillac/GMC stuff), to see if in fact there were 2 different P/Ns used. I'm thinking that since there is only an .080 difference in dia., that both sizes of sway bars, *may* have used the same bushing.
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Old 01-28-2013, 10:58 AM   #7
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You can buy the 22mm and trim a bit from the split area on the bushing. this wil allow it to close tighter on the 20 mm bar. A coin or piece of metal under the bushing will help increase the pre-load on the bushing too.
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Old 01-28-2013, 01:47 PM   #8
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Default GXP rear sway bar

I was going to try and go to the dealer if I had time this week. Just thought it would be easier to ask on here. Doesn't seem like anyone knows where to get polys for the back. I was gonna Email whiteline and see if they would sell me a 20mm that would work also.


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Old 01-28-2013, 04:22 PM   #9
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Default GXP rear sway bar

So I just measured and it is a 20mm bar. Anyone know of a company who makes a 20mm poly for our cars??


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