sound like a bad cv joint aka axle shaft check rubber boots on left and right axle if they are cracked and open chances are cv joint went bad from lack of luberication and contaminents
Worn left front wheel bearing.
i have a grinding noise on the front left wheel. i have taken the calipa off and i have one brake pad that is shot. could it be that or can it still be the bearing. how can i find out.
Worn front axle and/or front end component.
Tie rod
You need to check the front wheel bearings, while driveing down the road stright turn the steering to the left and then to the right and listen to see if the hum noise changes, if not then both bearings are bad left and right sides. If the hum noise changes while turning to the left then right front bearings are bad , if hum noise changes while weaven to the right then left bearings are bad.
Sounds like you have a bad left inner wheel bearing.
Wheel bearing
Bearings misassembled, tire nosie, brake noise, noise in axle, noise in transmission, etc.
when the truck has been driven 20 to 30 miles you can hear a noise comming from left front
If a bearing is bad, You will hear a whining noise from the bad bearing. Try to listen if it is up front or back. The noise will get louder as you go faster. Turn left and right to determine what side the bad bearing is on. If you turn left and the noise gets louder, the right bearing is bad, turn right and the noise gets louder, the left bearing is bad.
Possible wheel bearing, see if noise changes on left & right turns.
Possible failed U joint or cv joint at the left front wheel