1978 F-100, 300 six with C-6 automatic, extremely high mileage, and at a steady cruising speed, it has a loud rumbling and vibration that goes away if you let off the gas or mash accelerator pedal. Any ideas?
vibration/rumbling sound
Nov 29, 2004
6 Replies
Motor mounts? Tranny mount? They can be bad even if they look good to the eye. Those are probably the first things I would check. MK
I have the same problem with my 1982...I THINK it's tire rumble. but mebbe input shaft? VERY noticable on the interstate above 65 mph...
Its got new tires, so I don't think that tires are the cause. I will check the motor and tranny mounts though. This truck is very tired....501K miles, and it really shows it lately. I have been thinking of restoring it, but I have a feeling it would cost as much as my house to do that. The old girl has a lot of sentimental value to me though. Thanks for the responses.
Sounds like a u-joint to me. And a visual or shake test won't do. Take them out and inspect. Replace as needed.
s
Re: vibration/rumbling sound
- snipped-for-privacy@not.hotmail.com (Steve=A0Barker) wrote: Sounds like a u-joint to me. And a visual or shake test won't do. Take them out and inspect. Replace as needed. And that was the culprit. They were only a couple of months old and failed. Replaced them at the same time I had the transmission rebuilt. Thanks for the responses.
I had the same issue with my 1989 Ford Bronco II. As long as there was torque on the motor, it was fine. No torque there was rumble. Well I took it to my mechanic and he had to replace the throwout bearring in my Manual transmission.
snipped-for-privacy@webtv.net (J Grant) wrote in news: snipped-for-privacy@storefull-3314.bay.webtv.net:
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