Bad vibes !

[1966Canuck]

Hello all ;

I have a 1966 Dodge Coronet 318 Poly 2bbl, automatic transmission. The drive train is all original to the car.
The car has driven flawlessly for about 4,000 miles since I purchased it in the fall of 2022. I have developed a vibration which is noticeable under load at low speeds especially on inclines.It almost feels as though something is thumping off the floor under my feet when it happens.I think it is at certain RPM but I do not have Tachometer.It is unnoticeable at 50 plus miles an hour even when I hammer on it

I am partially disabled so I had a friend crawl underneath and look for obvious things like clearances but I feel it may be something like a partially seized U joint?There does not appear to be any grease nipples on the U-joints.
I was also suspecting a loose mount ?

I will be taking it in too somebody but my mechanics are over an hour away so I thought I would ask all of you out there for some advice in the meantime.
Thank you in advance

 

[Jerry Hall]

Possible transmission mount. The U joints can be checked easily with everything in place.

 

[1966Canuck]

good advice Jerry..... thanks for your input.

 

[Darter6]

U-joints most often will show red rust powder around the caps. Many times they will start to squeak too.
As stated above check all mounts, engine and transmission isolators.

 

[Nxcoupe]

Sounds like a misfire, possibly?