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Thumping/clunking noise...

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Old 04-17-2019, 11:11 AM
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MN98C5
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Default Thumping/clunking noise...

I have a 98 base coupe 6 speed with 75k. I took the car our for dinner last night with no issues, until I left the restaurant and it had developed a clunking noise which is relative to speed and can be felt in the shift ****, no feeling in steering wheel. It may have started after hitting a pot hole, not sure as I had just started driving. In gear, out of gear, clutch In, clutch out, it doesn’t go away. I didn’t go past 30mph, it did seem less apparent on acceleration. Any ideas or thoughts are greatly appreciated!!

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Old 04-17-2019, 12:00 PM
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knewblewkorvette
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Maybe the torque tube bearings. That's the sound I had when my 98's bearings decided to grenade.
Old 04-17-2019, 12:02 PM
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Old 04-17-2019, 12:47 PM
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How many miles did that 6 shooter have on it? I've been thinking I need to change mine soon also. I'm at 94K now.
Old 04-17-2019, 01:02 PM
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If I remember correctly, about 100K miles. She did have 905 HP though, might had a little to do with it


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Old 04-17-2019, 01:55 PM
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byte_me
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Originally Posted by MN98C5
I have a 98 base coupe 6 speed with 75k. I took the car our for dinner last night with no issues, until I left the restaurant and it had developed a clunking noise which is relative to speed and can be felt in the shift ****, no feeling in steering wheel. It may have started after hitting a pot hole, not sure as I had just started driving. In gear, out of gear, clutch In, clutch out, it doesn’t go away. I didn’t go past 30mph, it did seem less apparent on acceleration. Any ideas or thoughts are greatly appreciated!!
Axel shafts also make a clunking noise when they are loose. Pop off the rear caps on the rims, I want to say those nuts are 31MM, and a breaker bar. Give them a turn...I have had this many times on the several C5's I have had...tighten them up, and clunking goes away...
Old 04-17-2019, 05:03 PM
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MN98C5
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Originally Posted by byte_me
Axel shafts also make a clunking noise when they are loose. Pop off the rear caps on the rims, I want to say those nuts are 31MM, and a breaker bar. Give them a turn...I have had this many times on the several C5's I have had...tighten them up, and clunking goes away...
Also, I lowered the vehicle on stock bolts last week before getting new tires and an alignment. I’m guessing that is unrelated but thought I would throw it out there. The vibration in the shift **** is an unpleasant feeling 😖
Old 04-17-2019, 05:51 PM
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Maybe you can take it back to the alignment shop and have them look at it. If you hit a pot hole, it’s possible something came loose or adjusted the alignment. I’d start there on the lift.
Old 04-17-2019, 07:52 PM
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MN98C5
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I’ll get the car on a rack in the next couple days. Does the fact that the noise and shift **** vibration happen no matter wether I’m in gear or not eliminate anything terrible?
Old 04-18-2019, 01:37 AM
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Moved to C5 Tech.
Old 04-19-2019, 07:14 PM
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Well I pulled off the wheel caps and the axle nuts are tight. I took it around the block after sitting for two days and afte about 30 seconds it developed the ticking/clunking noise... I’m really confused why it happens with the clutch in and goes with the speed. Everything looks clean and feels tight underneath.What am I missing??!! 😤
Old 04-20-2019, 10:18 PM
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My money is still on the torque tube bearings
Old 04-24-2019, 03:51 PM
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Old 04-25-2019, 02:42 PM
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do you have aftermarket exhaust?

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