Terrible shaking
 

So a few days ago my car started vibrating just a wee bit as I got up to speed in the higher gears, I had to be going 50-60 mph.

I noticed but didn't think much of it until recently when the vibrations got a lot worse.

I jacked it up to see if it was obvious and I found the lower right transmission mount bolt had come almost all the way undone. I retightened the bolt and immediately there was a change, the vibration was almost gone-for about 1 mile.

Then as I got up to speed I notice the vibration once again. I have since jacked up the car and the bolt I originally tightened is still in place. I can't see any other loose bolts either.

I check the oil level and there is plenty.

Any help?

Check the driveshaft and inspect the tires.

Tires okay U-joint looks a little sketchy and I have a cracked oil seal on the rear of the transmission, looks like I have work to do