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EFV-8 Club Forum / 1940 Ford Discussion / Thumping Noise

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Discussion Topic: Thumping Noise

JayChicago

05-02-2026 @ 12:04 PM

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'40 Tudor. When driving over road bumps, hear a thumping noise from rear of car. Sounds just like something bouncing on trunk floor. Don't recall hearing this when I got the car ten years ago, developed in recent years. Any ideas on what I can look for?

Here is what I have looked at so far:
Removed everything from the trunk, including the tool compartment wood panels. No change.
Spare tire, trunk side panels, rear seat cushions, package deck panel, all seem secure.
Put 40 lb. bag of Weed & Feed on trunk floor. No change.
Under the car, nothing loose. Fuel tank seems secured with the spring bolts. Can't replicate the sound by moving or banging against anything.

Could springs or shackles or shocks make a hollow thumping noise?

kubes40

05-02-2026 @ 1:05 PM

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Jay, if that were in my shop, I'd disconnect the shocks and try the road.

An exhaust pipe hanger broken? The rear hanger has a tendency to break from the rubber insulator. It can often appear to be fine. Humor me and pull down on the tail pipe a little.

If the spring is shot, it is all together possible the rear axle assembly is bottoming out.
Can you post a photo of the spring? A photo of the right / left spring shackles?

Mike "Kube" Kubarth

carcrazy

05-02-2026 @ 1:40 PM

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The rear "dog bones" that connect the shock levers to the axle may be worn excessively or the shocks may have internal damage that is causing this thumping noise.

JayChicago

05-03-2026 @ 10:33 AM

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Thanks, guys. I will try all those things. When I can, will get car up on jackstands and try to get decent pics of springs/shackles. Will come back when have something.

Kube, just went to the garage now, tried to move the tail pipe. No movement. That rear hanger was broken when I got the car, good reproduction hanger on there now is still good.

Will get into the shocks, drive with shocks disconnected. Already had to replace one of the rear shock dog bones. (what a PITA that was!) But that noise was different.

This noise is more of a heavy gauge sheet metal sound, more of a drum sound, like something lightly thumping against a floorboard or inner fender.

This message was edited by JayChicago on 5-3-26 @ 10:52 AM

ford38v8

05-03-2026 @ 10:47 AM

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Jay, move forward to the muffler to wiggle it. You haven’t the leverage to move it at the rear hanger.

Alan

JayChicago

05-03-2026 @ 10:56 AM

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Thanks Alan. Been all over the exhaust pipes and muffler. With this noise, that was my first thought too. Exhaust all secure.

This message was edited by JayChicago on 5-3-26 @ 10:59 AM

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