I would get one from Napa

 

I'm starting to think it may be something more serious then a mount. It is more then likely bad, but the vibration got a lot worse and now it feels like the jeep is going to fall apart whenever I drive it. Could the mount being bad mess with my pinion angles when I'm accelerating or anything else?

 

Time for some noggin pokin under the Jeep to look for some loose stuff like u-joints, mounts etc.

 

What mph does it happen? The double cardian joint on my front drive shaft went bad and any time I drove the jeep over 50mph it vibrated ike crazy

 

I already replaced a few months ago. And when that went out it shaking was all the time.
The vibrating starts as soon as I accelerate pretty much, and goes anyway when I'm in neutral or coasting. An it stays pretty much as violent no matter what speed. It does vibrate more, the harder I accelerate.

 

Can you hear it more or feel it more??

 

Certainly feel it. It vibrates very badly

 

Do as cruiser said and noggin poke

 

freegdr suggested that you check your mounts by "power braking".
That's easy to do in an automatic...more difficult with a manual.
I don't know if you did that, but it means putting the tanny in first gear, e-brake set HARD (Chock the wheels as well.)
GENTLY feed in throttle and slip the clutch, like starting on an uphill grade.
Watch the motor with the hood open.
If the left side mount is bad, there will be a point where a cetain amount of torque will cause the motor to jump up and to the right. Then you know you have a bad mount.
It's otherwise hard to know by looking (unless you actually remove it).

That's how I solved my "bad vibration under load" problem.

 

I already checked the engine mounts, visually, powerbraking and with a prybar. They are good.

Like I said when I take off, there is usually some kind of thumping sound, it seems to come from behind me or maybe under me? And I checked all of my u joints, about 2 months ago and yesterday and they all look good, no movement.

 

I'm still thinking trans mount

 

Check to see how much clearance there is between the exhaust pipe and crossmember.

 

This

For testing purposes only you can put a bottle jack under the exhaust and raise it high enough to slip a small block(1 or 2") between the crossmember and the tie in metal part that goes from the exhaust to the tranny mount.
If you can't understand that without a pic let me know and ill get one for you

 

There is maybe 1/4 inch between the exhaust and the cross member.
And if you could post a pic that would be awesome

 

You should be able to stick your thumb between the pipe and crossmember. I doubt you have 1/4" thick thumbs............