Rear End Clunk - Driveline
If I am rolling and holding a gear, low RPM, and blip the gas and let of, I can hear and feel a clunk while catching and engaging power and the clunk when letting off.
Sounds like a bowling ball rolling around in the spare wheel well
Any idea where to start with this?
I don't think its transmission, I had the fluid level checked and it was good.
It feels like something is loose in the driveline/driveshaft in my opinion. Feels sloppy.
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
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2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
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2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
Rear End Clunk - Driveline
Very strange. I just noticed the same thing a few days ago but mine is more intermittent. It seems to only happen if I brake hard right after an up shift, but not every time.
I assumed it was something loose in the trunk but emptied the trunk last night and was able to make the noise this morning. I am very interested in opinions on this.
I have the GXP rear if that changes anything.
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That is how mine started, didn't do it all the time. It's getting pretty bad now, as to where I need to bring it in. It does cluck more often when downshifting coming to a stop too, upshifts at high rpm are not an issue.
I have the Camaro 3.45 Differential.
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
In older cars it usually was a sign that a u joint was going out, so I would think I would start with the driveshaft. Might check the rubber couplers and give the shaft a turn with your hand to see if it has any play. Driveshaft that is. LOL
2008 MGM GT. Patrick G spec'd 222/226 .597”/.605” 115LSA +3 cam, Ported TB, Ported Manifold, 25% PB UDP, 180* Tstat, Vararam w/HSRK, Kooks 1 3/4" LT Headers, X w/cats and muffs, GXP Diffuser, B Splitter, 6000K HID's, 6.0L Badges, Tinted Side,Rear Markers and Tails, 15% Window Tint, Blackedout Chrome, Ghost Stripes, G2 Red Calipers
Thanks Vert.Originally Posted by vert
U-Joint, have any pics of what/where that is. I recall trying to spin the driveshaft a few months ago and it had no play. Also, rubber couplers, let me know what you mean by those. I'm a visual person, lol.
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
Found this thread, so I can visualize.
Are the U joints the ends of the driveshaft, shaped like a U? ()
http://forum.grrrr8.net/showthread.p...hlight=u-joint
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
Found this thread too, sounds like the last 3 posts are exactly what is wrong. Now I need to know what thier cure was.
http://forum.grrrr8.net/showthread.p...hlight=u-joint
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
Not sure if you saw this from CP, parts diagram
http://forum.grrrr8.net/showthread.php?t=14220
Yup, thanks!
I just printed this out and plan to check bolt tq specs on mine. I am not sure how to tell if the UJoint is bad, but I'll crawl around and take a peek
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
Ok, just crawled under the car. I can turn the driveshaft a tiny bit and it clanks as I go back and forth. Bolts seem tight though.
2009 Pontiac G8 GT - Magnetic Grey Metallic - 12.243@115.81 (10/06/2012) (SOLD - Dec. 05, 2013)
[COLOR="#000000"]
2008 Saab 9-7x Aero - Carbon Flash Metallic: (SOLD - March. 10, 2015)
[B][COLOR="#000000"]
2015 Chevrolet Silverado Z71 4x4 - Deep Ocean Blue Metallic: E85 conversion, Texas Speed LT Headers, Borla Muffler, Airraid MIT, Tuned & Converted by CJTunes.
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