vibrations / driveshafts?

i was coming home the other night and a god awful vibration went through the car at about 60 mph. i think i threw a weight. the universals are new and the wheels still have thier weights. sound like a good place to start? i wont be able to get under it until next week.

 

only at 60MPH ? any noises? what kind of car / drive train?

 

What kind of tires? I had issues like that with my bias ply tires even after balancing. Found a place that did road force balancing and made a world of difference.

 

Need more info!

 

I'd jack it up and run it. Watch the wheels and driveshaft for vibrations.

 

Wheel, tire, and drum vibrations generally come in at higher speeds than driveline vibrations, what speed does the bad vibration start?

---John

 

Motor mounts?

 

39 ford with 350 engine and trans, maverick rear. new diamondback tires. drum brakes on rear. no apparant noise that i remember. the car has around 80 miles on it. like someone said i'll look under it then run it up on stands. and wait....

 

found it! rear universal. its a new NPJ piece that a shop put in. i must have done something wrong installing the shaft.

 

Ouch.