Clunking noise in my rear end.
03-30-2017, 05:46 PM
#21
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Hey all, bump to an old thread. Just broke 100,000 miles and my front diff bushing is toast along with the drive shaft cradle bushing/bearing...
I'm looking into the poly trans-mount insert from revshift and the poly front diff bushing from revshift or creative-steel. However, the tech at Cadillac is warning me against going solid poly anything because of more vibration... Even if I go with the soft "street feel" 80A, is this still going to change rider/passenger comfort?
If not, I'd feel better having a solid bushing so it doesn't go bad again. Thanks for any info.
I'm looking into the poly trans-mount insert from revshift and the poly front diff bushing from revshift or creative-steel. However, the tech at Cadillac is warning me against going solid poly anything because of more vibration... Even if I go with the soft "street feel" 80A, is this still going to change rider/passenger comfort?
If not, I'd feel better having a solid bushing so it doesn't go bad again. Thanks for any info.
03-30-2017, 06:00 PM
#22
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Join Date: Sep 2008
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I've got the black mount from CS. Very little added vibes at idle only, feels mostly stock everywhere else. Feels better than stock, solid with no negatives. I don't have the diff block.
03-30-2017, 06:54 PM
#23
The typical caddy ppl want to ride around on a marshmallow and complain when they feel anything. We are not that crowd. If the soft mounts from cs made zero difference driving. Maybe a titled at idle but I honestly can't tell. The trans and diff bushing didn't add anything vibration wise as well for my car. Just my .02
03-31-2017, 01:11 PM
#24
We may not be that crowd, but replacing my front with a CS RED bushing years ago did create some additional NVH noise in the cabin. Bit of a pain on long drives. But it does depend on your specific car and diff. Some will be quiet, others will be noisy.
04-04-2017, 10:21 AM
#26
The black street hardness CS diff bushing was the very first mod/fix I did to my car. It was night and day difference. The bushing I replaced was only 2 years old according to the service records and made driveability terrible when operating the clutch. The black CS bushing did not add a significant amount of noise, but my differential has been fairly modest in noise levels. I have no idea why GM specified such a soft and unsupportive bushing and continued to do so. Even a solid rubber mount would have been better and posed no more threat to the weak aluminum differential. 6 years later and no regrets.
