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Discussion Starter #1
Had the rear end clunk in my GTO in 1st and reverse gear when moving off the line, very intermittent, finally fixed it. I had the rear crossmember bushes changed to original GM rubber bushes and got rid of the aftermarket solid bushes. Car feels so much better and not so hard riding. Just thought I would let people know.
 

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Pontiac Fanboy
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When you say solid, do you mean solid metal bushings or one of the popular polyurethane bushings out there?

Your experience is interesting because I had a popping/clunking noise that was cured by replacement poly bushings.
 

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Discussion Starter #3
Don't know what there were made of but they were like solid plastic not rubber at all, maybe hard poly. Not soft like super pro or nolathane. I had tried everything else my cv shafts were new, had my diff checked out no problem with my diff, had my driveshaft balanced and checked so suspension was the last resort. When the diff guys checked my diff they noticed all the bushes in my suspension and said the hard bushes transfer a lot of noise in the rear suspension. So I thought I would change those cross member bushes because they seem to be the main ones and the GM rubber ones only cost me $100. Been testing the car for 2 months no clunk and feels really good when accelerating hard off the line.
 

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Those bushings won't make noise unless they are loose and able to move around, properly installed and torqued they quiet. Most likely scenario is the replacement bushings are installed correctly. Another possibility would be the issue is still there but now the soft bushings are absorbing must of the noise.

When the diff guys checked my diff they noticed all the bushes in my suspension and said the hard bushes transfer a lot of noise in the rear suspension
Is the point, you still don't know where it is coming from. I gather you are not doing the work yourself, rather going by the word of others?
 

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2005 GTO MT Red, Red, Pee the bed.
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Considering the amount of gears, splines, CV's and U joints the tourque travels through, change of direction doubles the lash each attributes to the clunking. If it don't fell like the drive shaft might poke you in the rear, I wouldnt worry.
If you ever operated a high end Lexus or Caddie SUV you see its hard to overcome a little clunk now and again.
 

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Discussion Starter #6
The point is the noise is now gone no clunking. The Diff guys were honest with me they could have told me it was in the diff and charged me for a new diff instead they checked it out and didn't charge me a cent. So yes I do go by their word especially when they have been in business for over 30 years specialising in diffs. Maybe the old bushings weren't installed properly, don't know. All I know is the clunk is gone and I didn't have to replace my diff.
 
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