Might try putting the rear in the air with the front tires blocked and then put it in gear and see if it makes the noise.

 

Had a nice day so I did the rear in the air deal above. There was no noise from anywhere until some brakes were applied. Had to get the wife to help so I could pinpoint the area of the noise. It's coming from the rt. rear so that is the next thing I am going to tackle to see what is going on there.

 

Flushed all the brake fluid out of the system the other day and noticed the right rear had quite a bit more travel than it should have. Took the drum off today to adjust it up and see if I could determine what the squeak was. After adjusting the slack there was still a light squeak when the drum moved. Took a while but finally narrowed it down to the coil spring that holds the front shoe on. It was resting against the back of the shoe so I put enough pressure on it to move it away from the shoe and there was no more squeak. Haven't driven it yet, but I'm hoping the noise is taken care of.