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06-24-2018, 05:26 AM | #1 |
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Join Date: Jul 2011
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Strange rear of the car low frequency rumble when letting up on the gas
I’m at a loss in discovering the source of a low frequency rumbling sound coming from the rear of my ‘31 Slant sedan, when I let up on the gas pedal. This is not an engine or exhaust noise. I have checked/adjusted the tailpipe muffler clamp several times, so I don’t think that is the source. I’ve even wrapped a piece of high temp silicone rubber under the tailpipe clamp to isolate any tailpipe vibration from being transmitted to the frame. I welcome any thoughts on the cause of this annoying and prominent sound. Thank you.
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06-24-2018, 07:08 AM | #2 |
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Location: Hat City (Danbury CT)
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Re: Strange rear of the car low frequency rumble when letting up on the gas
My issue sounded like yours , I replaced u joint and front bearing in torque tube
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06-24-2018, 08:51 AM | #3 |
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Location: Connecticut Shoreline
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Re: Strange rear of the car low frequency rumble when letting up on the gas
I would look towards the u-joint also.
Two quick things that I would do. Check your transmissions oil level. Than using John Deere Cornhead grease fill your u-joint cavity until it starts coming out of speedometer gear opening. Could take a full tube. I have seen U-joints that have been bone dry for years. Enjoy. |
06-24-2018, 10:45 AM | #4 |
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Location: Mpls, MN
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Re: Strange rear of the car low frequency rumble when letting up on the gas
If the U joint is OK, then I'd check the differential pinion nuts and bearings.
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06-24-2018, 10:48 AM | #5 | |
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Re: Strange rear of the car low frequency rumble when letting up on the gas
Quote:
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06-24-2018, 04:33 PM | #6 |
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Re: Strange rear of the car low frequency rumble when letting up on the gas
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I wonder if this additional info below would impact your previous replies about potential U-joint or differential/pinion issues: My car makes these low frequency rumbling noises, coming from the rear of the car, when the transmission is also in neutral and the car is stationary; I hear it when I rev the engine and remove my foot from the gas. Thanks again. |
06-24-2018, 08:04 PM | #7 |
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Location: Land of Lincoln
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Re: Strange rear of the car low frequency rumble when letting up on the gas
With my 31 Tudor the rear seat cushion is removable and a great space to store stuff ! I would have to be careful what I stored there. Also maybe the body mount bolts might be a little loose.
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06-25-2018, 06:58 PM | #8 |
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Re: Strange rear of the car low frequency rumble when letting up on the gas
Thanks, Big hammer.
I checked out your suggestions, but so far, no luck finding the smoking gun. I welcome any other suggestions. Thanks again. |
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