Sounds like brake pads, may b wheel bearingsneed to jack up to check if wheel bearings u will feel freeplay pulling wheel hand on top and bottom of wheel to feel 4 play
SOURCE: right front wheel grinding noise
The Hub Bearing is shot jack up that side and grab the top and bottom of the tire if you can move it in and out get it replaced.
SOURCE: I have a 2002 Chevy Tahoe making a grinding noise
On the full size, the front actuator is electric, not vacuum.
When in 4wd mode, a switch on top of the transfer case conducts 12
volts out to the actuator. Wire #50 (brown) is the 12v feed, and it
conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.
Check voltage at the connector for the front actuator (at the
front differential - it looks like a large bullet that threads into the
front diff.) If it has 12 volts, the actuator is the problem. If it
does not have 12 volts, check the transfer case switch and the power
feed to the transfer case.
I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated
by voltage. When it heats, the pin in the end swells and pushes a shift
fork in the front differential. The shift fork engages a spline on the
passenger side of the differential, and boom! you have 4WD.
GM offered an upgrade to this actuator that is a motor instead of a
heated device. However, it requires a small harness addition, a spacer,
and a new actuator. It is about a $150 to $200 option.
Good
luck. The actuator is usually the problem 90% of time but recheck all
of the wire harness just to maker sure there is no short before
replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.
88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME
AND
COMPONENT RELIABILITY.
SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED
INTO 4X4.
If the grinding is only when you apply the brakes, then it's going to be replacing the break pads and rotors and may be the brake caliper if it's damaged from the worn out brake pads. Please keep me posted, be glad to know you got your Tahoe running 100%
SOURCE: grinding noise in front end of 98 malibu the wheel
you got a faulty bearing in your vehicle, tell me dose the noise get louder as u speed up let me know by texting 4195458235 I will be happy to help you at no coast 2 you
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