Bad vibration while driving

[alpinee30m50]

I already searched and couldn't find what I was looking for, so please refrain from flaming me. A while back i had a wheel bent by a tire shop and drove on it for a couple weeks because I was too broke for a new wheel and had to get to work. Now I have a new wheel on it, but there is a horrible shake while driving, it feels like the entire rear end of the car is shimmying down the road. It gets especially violent at freeway speeds, so much so that it shakes me from side to side in my seat, so as you can imagine it isnt being driven right now. There is no noise and the wheel bearing seems fine, and it never did it before I had the bent wheel on. I think it might be the CV axle, but I'm not sure how to diagnose it. The entire driveline is fresh from the guibo to the differential, and its all in good shape still, so i don't think that's what it is. The CV does not look bent, but it'd probably have to be pretty fucked up to be able to see a bend when its not spinning in it. So can anyone give me any advice on what this may be or how I should go about diagnosing it? I'm trying to avoid taking it to a shop, but if I cant figure it out I'm gonna have to.

Thanks guys,
Jesse

[duckBoy]

I dont know anything about this subject so ill give you a bump.

Check the trailing arm bushings?

[vpilarrt]

Check for another bent wheel and make sure all wheels are properly seated on their hubs and lug bolts are tight.

[jlevie]

Move the rear wheels to the front and see if the vibration moves to the front. If so you have a bent wheel or out of balance or out of round tire. If the vibration doesn't move you have a problem with the rear suspension or a half shaft.

[bowtie2bimmer]

Ya check the balance of the wheels. Its not uncommon for a weight to come loose and this would cause and increasing vibration with speed