I have a 2006 Silverado 1500 4.8 5 speed manual transmission. I just recently replaced the clutch and it has been doing well for weeks now, however just the other day it started to make a low pitch vibrating noise when I accelerate in low rpms mainly only 3rd gear. Transmission has fluid as well as the transfer case and I can’t seem to find anything under the truck loose. Any help would be appreciated