Yes - did replace the motor and problem solved

I have read several other posts on various sites about similar noise in Maytag Dryers. Ours varies from very high pitched squeel to annoying loud noises when the dryer is running. We have replaced the drum rollers (not the shafts), the front teflon bearings, the idler arm and bearing and the belt. We ran the motor when dryer disassembled and it did not appear to be making any unusual noises by itself. We removed the blower fan and cleaned out that area completely and noted the fan hole was a proper D shape. The felt seems in good condition. After carefully reassembling everything, it still makes the noises...not continually...but most of the time. If you stop it, it will start up quietly for a while before beginning to make noise. The size of the load does not seem to affect the noise. When you open the door, the squeeling slows down with the drum and stops. I am at my wits end. I don't want to install a new motor if that isn't what it is. I cannot see any way to lubricate the motor shaft. The drum roller shafts looked good. I lubricated with sewing machine oil when reinstalling. Anyone got any other suggestions?:(