I have an LG DLE3777W electic dryer that was making a sqeeking noise but is now making a banging and vibrating noise. I think the bearings are gone. I do not have a prts manual so I do not know what to replace. CXan you tell me what parts I should be looking for to order?

When you do hear your LG washing machine making a loud banging type of noise on the spin cycle it could be caused by overloading or a loud that is unbalanced Or the bearing has worn out and needs replacement.

Most of the time a tumble dryer will work like a dream but, as with all appliances, occasionally there will be technical problems.
If your tumble dryer is making a banging, whining (or other strange noise) it's best to diagnose and sort out the problem. It could be the result of a number of things, but what you certainly don't want to do is ignore it.
Here are the most common reasons for your tumble dryer making odd noises.
Coins and keys
One of the most common reasons for a banging, rattling or clanking is keys or coins left in pockets - so always check them before you put any clothes in the tumble dryer. More often than not you won't hear anything until the dryer cycle is in full spin.
Uneven surfaces
If the dryer is vibrating or shaking during spinning, check to make sure the dryer's sitting on a level surface. If it's fitted with height adjusters on the front legs, adjust them accordingly to ensure the machine is level as this will often reduce or eliminate the banging sound.
Drum bearings
If the tumble dryer is noisy when its turning and the whole appliance is shaking and rumbling, it could be indicative of a problem with the drum bearings, which help the wheels turn freely and easily.
The drum
If the banging noise is continuous when the drum is turning then it might be problem with the drum itself. If the noise is a metallic one, it could be the result of the drum scraping on something inside the machine. You could always check the drum visually for any marks or dents.
Motor bearings
If the tumble dryer is emitting a high-pitched screaming or whining noise it could be a sign that the motor bearings are wearing out.
Tension pulley wheels
If there's a squeaking noise coming from the dryer it could be the result of wear on the tension pulley wheels. This occurs more frequently on older models...or try this link..
Common Tumble Dryer Problems

I don't know if your warranty is up but its covered if not. I have gone and swapped out dryers for same problem and they were LG's and It always seemed.to be those rubber wheels

sounds like the bearing may have gone out, here is a website they may help, even though it is for a Maytag it is the same thing , Tim:

http://www.ehow.com/how_4829560_fix-squeaking-maytag-dryer.html

yes the belt has a tensioner with a bearing and a roller surrounding the bearing
the bearing can be locked up which will put flat spots in the roller m,aking the banging noise
Sound horrifying at times doesn't it?

you have to specify what make your dryer is to be able to answer question

If you can open one of the smalle panels to see inside around the drum- check to see if the belt is rubbing and there is black rubber dust or strings around that area. It is probably one of the bearings or felt gaskets or seals that the drum rides on.

The reason to this problem is the belt.It might have gone
bad.You may need to replace it.

It Is fixable.All you need to is try to balance the load or a perfect concrete flat surface for the machine.
If the problem still persists, then during the previous vibrations, the shocks or the drum bearings might have been damaged, you might have well replace them to avoid further problems.good luck.and please post your comments.

Probable cause is the bearing on the wheel that turns the drum is worn out. They are easy to replace and should cost less than $25. for the part.
Remove the front of the dryer and turn the drum by hand, you should be able to tell which side is worn.
Be sure and unplug first.