I think the 3.4 torque in combination with my lead foot has begun to damage my already old u-joints.

I am getting a vibration through the entire vehicle and not through only through the seat or steering wheel. It is similar to driving on the rumble strips on the shoulder of the road. Under acceleration it is noticable, but when I let off of the gas it is really prounounced. Thinking it is the u-joints. Any other thoughts? It came on very quickly. Basically right after a burnout on dry pavement. I guess just because you can do it doesn't mean it is a good idea. hehehehe