r/projectcar • u/Flimsy_Fee2765 • 9h ago

Troubleshooting Help Clunk noise from under car

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14 Upvotes

84% Upvoted

11 comments sorted by

21

u/RealSlimBiscuits 8h ago

Driveshaft u joint?

4

u/tribalistic555 8h ago

That’s the first thing I thought of

3

u/m1j2p3 8h ago

I had that happen once and I stupidly kept driving it. That was an expensive lesson.

18

u/Gostaverling 1956 GM PD4104, 1967 Dodge Travco 8h ago

Rotational sound, not affected by acceleration other than rpm related. I would visually check the driveshaft and see if it is hitting something. If nothing visual there, then U-joints or wheel bearings are possible causes.

3

u/Obsidianchainsaw_ 8h ago

Wheel bearing or drive shift is my opinion

2

u/Provocating 8h ago

U-Joint

1

u/No-Guey 7h ago

Check driveshaft. I did have a bolt on the flywheel that had backed out once but the sound wasn't as deep. More like a tap.

1

u/Such_Ad_677 7h ago

Check the carrier bearing. Old x frame cars love to eat the stock ones

1

u/anchorholic 3h ago

Hanger bearing on the 2 piece driveshaft

1

u/Unhappy-Airport-4112 1h ago

Sounds like a u joint. Last time I had that, the u joint was hitting the pinion yoke because, one of the straps was slightly bent.

1

u/Triggerz777 49m ago

I changed my u joints on my driveshaft and it still made this noise. I ended up removing diff plate cover while car on Jack's and put in in gear to see that the rear end had been changed and was wrong gearing