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 Post subject: rear cradle bushings
PostPosted: Wed May 17, 2017 5:25 am 
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Joined: Tue Mar 19, 2013 11:30 pm
Posts: 1203
Location: Canton GA
Came across something that may interest some 2011-2013 (WM) PPV owners. These parts are already on 2014-2017 PPV's.

Stories here:
https://www.holden.com.au/cars/commodor ... motorsport
"With a unique rear suspension subframe bush, the Motorsport has impressive rear suspension location control so you can feel confident under maximum lateral and braking events."

http://www.motoring.com.au/final-aussie ... ons-105535
"The Motorsport Edition alone swaps to a higher-rate rear subframe bush sourced from the US police car program [PPV] that applies a constant radial rate, rather than the different cross-car and fore-aft rates of the previous bush. Pinnuck says this provides better driver feedback on the limit laterally and under braking."

Current PN's for 2014>2017 sedans - same parts used on PPV (WN) & Chevy SS - and will backfit to WM chassis
92457826 - rear position (qty 2) - http://www.gmpartsdirect.com/oe-gm/92457826
92457827 - front position (qty 2) - http://www.gmpartsdirect.com/oe-gm/92457827

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 Post subject: Re: rear cradle bushings
PostPosted: Wed May 17, 2017 1:31 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 512
Location: SE PA
I have to wonder if you can really feel any big difference unless you are talking about a 100K+ mile car that was used on patrol. Regardless bill good find. I can tell you from experience those bolts are a PIA to remove but its doable, anyone in the salt belt area I would highly suggest checking yours if not actually just removing them at some point and checking for rust etc. I believe at least 1 member here had an issue with one of them not coming out and the dealer having to perform some surgery on the body or cradle. I also don't know that those bushings just pop out when I was looking at mine I believe they were a press fit piece?


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 Post subject: Re: rear cradle bushings
PostPosted: Wed May 17, 2017 2:10 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1278
Location: Pearland, Texas
Not sure if you're referring to me, or not, but yes, if your car is in/came from the Great White North, it's worth it to at least check the cradle-to-body bolts. When our car was in for the fuel pump recall, it took an additional couple of weeks working on getting one bolt out. I believe they eventually got enough leverage on it to get it loose, but it took quite a bit of work.

Additionally, when replacing the passenger side battery, I discovered that the ground strap bolt was rusted into the trunk floor, causing it to snap when I tried to remove it. So, yeah, really check things over.

Those bushings are press-in, but I seem to remember reading some of the posts on the G8 forums that this bushing isn't terribly bad to R&R. I think getting the bolts out and getting room to work is the hardest part, from what I've read.

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Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
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 Post subject: Re: rear cradle bushings
PostPosted: Wed May 17, 2017 5:21 pm 
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Joined: Tue Mar 19, 2013 11:30 pm
Posts: 1203
Location: Canton GA
xcidmigs wrote:
I have to wonder if you can really feel any big difference

I know that since "Day One", it was clear that in transitional movements that heavily load the rear, I can feel the back of the car (2011) doing something a little weird, and it's not based on tire slip--it's the cradle moving in relation to the body. If the later-spec cradle bushings help with that, I'm interested.

CrashTestDummy wrote:
Those bushings are press-in, but I seem to remember reading some of the posts on the G8 forums that this bushing isn't terribly bad to R&R. I think getting the bolts out and getting room to work is the hardest part, from what I've read.

One reputable source big in the Camaro world says "go solid"--I do not know whether this option (for Camaro) will work on sedans, nor do I know if there are NVH issues with eliminating the compliance that the production bushings offer. While not applicable, the 2017 Camaro ZL1/1LE (Alpha platform) has solid cradle bushings as part of the production package.
http://pegasuscnc.com/5th-gen-camaro-20 ... minum.html

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 Post subject: Re: rear cradle bushings
PostPosted: Wed May 17, 2017 9:46 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 512
Location: SE PA
wouldn't a poly replacement be a good compromise between? NOt sure if anyones version will work though, I went through this with BMR thinking their poly inserts for a camaro would work and they do not.

http://www.bmrsuspension.com/siteart/install/BK024.pdf


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 Post subject: Re: rear cradle bushings
PostPosted: Wed May 17, 2017 10:19 pm 
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Joined: Tue Mar 19, 2013 11:30 pm
Posts: 1203
Location: Canton GA
There are options--here are listings for G8 and/or SS and, by association, Caprice--depending on brand & look-up data.

Replacement bushings:
https://whitelineperformance.com/pontia ... ing-w93165
http://superpro.suspension.parts/spf3918k

Inserts:
https://whitelineperformance.com/pontia ... ing-w93166
http://superpro.suspension.parts/spf2871k
http://superpro.suspension.parts/spf2872k

If there was the option, I would choose a Delrin material over polyurethane.

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