The Ford Barn

Pat Martone · 06-24-2018, 05:26 AM

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.

Step-down · 06-24-2018, 07:08 AM

My issue sounded like yours , I replaced u joint and front bearing in torque tube

WHN · 06-24-2018, 08:51 AM

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.

Tom Wesenberg · 06-24-2018, 10:45 AM

If the U joint is OK, then I'd check the differential pinion nuts and bearings.

DHZIEMAN · 06-24-2018, 10:48 AM

Quote:

Originally Posted by Pat Martone

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.

Check U joints! Sounds like a U joint issue!

Pat Martone · 06-24-2018, 04:33 PM

Sponsored Links (Register now to hide all advertisements)

Thank you for the informative replies.
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.

Big hammer · 06-24-2018, 08:04 PM

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.

Pat Martone · 06-25-2018, 06:58 PM

Thanks, Big hammer.
I checked out your suggestions, but so far, no luck finding the smoking gun.
I welcome any other suggestions. Thanks again.

06-24-2018, 05:26 AM	#1
Pat Martone Senior Member Join Date: Jul 2011 Posts: 495	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.

06-24-2018, 07:08 AM	#2
Step-down Senior Member Join Date: May 2012 Location: Hat City (Danbury CT) Posts: 647	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 __________________ "I can't cry as long as I know the Lord has risen "

06-24-2018, 08:51 AM	#3
WHN Senior Member Join Date: Mar 2017 Location: Connecticut Shoreline Posts: 1,977	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
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	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.

06-24-2018, 04:33 PM	#6
Pat Martone Senior Member Join Date: Jul 2011 Posts: 495	Re: Strange rear of the car low frequency rumble when letting up on the gas Sponsored Links (Register now to hide all advertisements) Thank you for the informative replies. 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
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,430	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. __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

06-25-2018, 06:58 PM	#8
Pat Martone Senior Member Join Date: Jul 2011 Posts: 495	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.