Last couple of days I noticed a "Chirping" noise coming from the rear of the truck. when I speed up it chirps faster and when I slow down it chirps slower. rear wheel bearings?? ideas plz..

68 chevy LB CCS 2wd 350 sb. also I just noticed it today when I kick it in ass to go It feels like the truck is roasting but it is not. I have big ass tires. I would have to major power break to light them up. any ideas on these 2?
Rich