grinding noise while driving

this grinding noise just started on my 96" tahoe 4WD. it is coming from the engine so i believe so. it runs the same, no lose of power or stalling. the engine light is not on. can any one help or know what it is. i like to work on my tahoe when i can so if i can fix it myself.......thanks!

Ed, does the noise happen sitting there idling ? If so take the belt off and start it to see if its still there. If its gone something belt driven is going. Shut it off and spin the pulleys with your hand try to find some roughness or possibly noise

Ed, does the noise happen sitting there idling ? If so take the belt off and start it to see if its still there. If its gone something belt driven is going. Shut it off and spin the pulleys with your hand try to find some roughness or possibly noise

hi bustedratchet no it does not make the noise while it idle, it does it when i put on the gas, on drive, while its in park and i push on the gas it won't make the noise.

Put it in drive whth your left foot on the brake.Give it some gas (powerbrake it ) not too much.See if the engine in lifting up. I'm wondering if the fan might be hitting the radiator shroud ? Or if it happens all the time while driving might be a wheel bearing.Or in the front differential if it's 4 wheel drive.