[Zoomies]

I recently noticed a sinusoidal vibration running down the highway. Im thinking U-joint but wanted some opinions just in case the joints are good. Feels like the vibration is in the back of the car.

454
TH400
10 bolt.

 

[Zoomies]

Same size tires all the was round and brand new to boot. Not sure what the gear ratio is and the driveshaft looks fairly new. I did not think about the pinion angle being off or the driveshaft angle not right. Still have not had a chance to crawl under the car but maybe this weekend.