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Old 05-30-2006, 02:50 PM
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Drive line clunk

Ok I am not sure what my problem is. (maybe mental who knows!)
I have a chevelle with a built 383, TH200R4 (bowtie overdrives), 10 bolt with a auburn posi unit, and 3.73 gears, Tires are drag radials 275/60R15. At shifts I get a drive line clunk. The first thought was u-joints. I grabbed the drive shaft and tried to move it but it was tight. Then I thought slip yoke?? I removed the drive shaft and that looks OK. Then I though Rear diff. Removed the cover and measured the lash that is .010 - .009. The last thought was a loose suspension member. I checked all the bolts and all looks good.
I decided not to trust my own judgment on the u- joints and am having them replaced and d-shaft balanced.
Oh it was starting to do this with my old TH350 as well. So, I don't think it is the trans.


Any other advice??
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Old 05-30-2006, 04:03 PM
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get it up on a lift and find out where the noise is comming from. You cant reliably check u-joints by shaking them, they need to be inspected.
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Old 05-31-2006, 05:44 AM
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A good way to find driveline clunk noises would be to have someone you trust in your car with the engine running shift it between forward and reverse gearswith the brake holding the car in place, and look at everything you can that might move or possibly make noise.

Checking the bolts on the control arms is only a part of the job, do you know if there is any excessive movement as a result of worn out bushings, these will allow movement and resulting noise.
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Old 05-31-2006, 07:24 AM
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Well the driveshaft is at DTS today and they are doing the inspection. I will post the results when I get it back.

I like the idea of forward and reverse and listening. However, I have never heard it in my driveway. It has only been on the road at light throttle (always under some type of load.)
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Old 06-06-2006, 08:50 AM
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Found the issue

Well I found the problem.
When I sent the drive shaft out they originally told me that "It's fine put it back in the car."

I insisted that they at least re-balance it. DTS sent it out and . . . . It was BENT! The guy at the balance shop call me and asked what the original issue was. I explained the clunk and though I should have it checked. He stated that it was bent. He then stated that he could fix it because it was not that far bent. He also recommended that I purchase a new drive shaft (better quality). We could not determine why it bent. I know I have not dropped it and the car has not been wrecked since the last balance.

Well it fixed the issue and I am on my merry way!
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Old 06-06-2006, 03:55 PM
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2004r are notorious for a clunk. We have a G-body madness group here in philly and it is a known problem. Especially when you take a rear apart and change the spiders, dial indicate the ring gear to be in spec, shafts are perfect, change the u-joints to some brute-force - as i did and found out the noise is the trans anyway. The clunk only gets worse when you redo the hole rear suspention with polyurathane.

May not be your exact problem but just letting you know.
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Old 06-06-2006, 05:21 PM
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I have heard that the 200R4s are "clunkers". unfortunately mine started with my old transmission at the end of last year. The old trans was a TH350.(built to the gills!)

Thank you for all your help!
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