I have a 1998 Honda accord lx 4 cylinder that makes a grinding noise up front only when driving, not while stopped. I have changed brake pads, rotors, calapers, cv joint, and wheel bearings. The tires are not rubbing. Either is the heat shield. What could it be? My friend said it may be the transmission bearings.... But the transmission shifts perfect. If it is the transmission bearings what is the fix?? Thank you for any advice or suggestions. By the way the car has 180,000 miles.

Is the sound constant with the speed of the vehicle or speed of the engine? Does applying the brakes or turning change the noise? Does the grinding sound like metal to metal contact?

WHEN braking at any speed ,does it make any differance to the noise ,Does the noise change with the changing of the gears ,Does it do it in reverse.
IF the noise dident change going up the gears and comming down then its sounds like the diff bearings ,and if a whine then its the meshing of the crown wheel and pinion which is where the CVJoints drive from ,but with out hearing it for my self i cannot say for sure but take it and have it put on a hoist and then check it out { not on a jack.}..
Let me know how you get on ,,,thank you
Ron