Pulsating grinding noise from front differencial

They may have damaged one of the ABS sensors in the front.
Take it back and have them check that their tech did not accidently unplug a sensor or damage it. What you think is grinding may be the abs coming on.

Without a description of the noise, this is impossible to diagnose. Common problem with these vehicles is a "grinding" type noise. This will be a bearing that has gone bad or brake pads that are beyond the service life (louder screeching or grinding upon braking). Popping noises are the CV drive axles are bad (noise is typically louder when when the vehicle is in motion and turning).

There are many possibilities that can cause car to make noise.

It's actually from where the noise is coming from. Front end or rear end. From engine area or from inside the steering or from brakes.

There is N-number of possibilities for the car to make grinding noise or any other kind of noise.

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For step by step troubleshooting this problem, I suggest you to refer the help links mentioned below. Its a complete solution with proper explanation to identify the cause of problem: ------

Click the link below: -----

ABS light comes on and Car makes Grinding noise?

http://repairhelpcenter.blogspot.com/2012/01/abs-light-comes-on-and-car-makes.html

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Car makes clicking noise?

http://howtobyme.blogspot.com/2011/11/car-makes-clicking-noise.html

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Car makes whining noise like driving on rough pavement?

http://howtobyme.blogspot.com/2011/12/car-makes-whining-noise-like-driving-on.html

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Chirping Noise From Car?

http://technoanswers.blogspot.com/2011/11/chirping-noise-from-car.html

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What are the possibilities for Clicking noise in car?

http://technoanswers.blogspot.com/2011/11/what-are-possibilities-for-clicking.html

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Squealing at start up on car?

http://technoanswers.blogspot.com/2012/01/squealing-at-start-up-on-car.html

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Chirping sound coming from engine?

http://technoanswers.blogspot.in/2012/01/chirping-sound-coming-from-engine.html

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Vehicle making Clunk Thump Thud noise?

http://howtobyme.blogspot.in/2012/03/vehicle-making-clunk-thump-thud-noise.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

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Heater makes clicking noise under dash on Ford Explorer?

http://technoanswers.blogspot.in/2012/01/heater-makes-clicking-noise-under-dash.html

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Clicking noise under dash and front defroster not working?

http://technoanswers.blogspot.com/2012/01/clicking-noise-under-dash-and-front.html

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Car Brakes Making Noise?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

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Car Alternator making noise?

http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

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Car Alternator Bearing Makes Grinding noise?

http://repairhelpcenter.blogspot.com/2011/12/car-alternator-bearing-makes-grinding.html

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Engine makes noise and Cooling Fan belt Breaks?

http://howtobyme.blogspot.com/2011/12/engine-makes-noise-and-cooling-fan-belt.html

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Vehicle Makes Clicking Sound While Taking turns?

http://schematicsdiagram.blogspot.com/2011/12/vehicle-makes-clicking-sound-while.html

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These will help.

Thanks.

There are many possibilities that can cause car to make noise.
Its actually from where the noise is coming from.Front end or rear end.From engine area or from inside from steering or from breaks.

There are N-number of possibilities for the car to make whining noise or any other kind of noise.

---------
For step by step troubleshooting these problem,i suggest you to refer the help links mentioned below.Its a complete solution with proper explanation to identify the cause of problem:------

Click the link below:-----

Car makes clicking noise?

http://howtobyme.blogspot.com/2011/11/car-makes-clicking-noise.html

--------------

Car makes whining noise like driving on rough pavement?

http://howtobyme.blogspot.com/2011/12/car-makes-whining-noise-like-driving-on.html

------------

Chirping Noise From Car?

http://technoanswers.blogspot.com/2011/11/chirping-noise-from-car.html

----------------

What are the possibilities for Clicking noise in car?

http://technoanswers.blogspot.com/2011/11/what-are-possibilities-for-clicking.html

--------------

Squealing at start up on car?

http://technoanswers.blogspot.com/2012/01/squealing-at-start-up-on-car.html

--------------

Chirping sound coming from engine?

http://technoanswers.blogspot.in/2012/01/chirping-sound-coming-from-engine.html

-----------

Vehicle making Clunk Thump Thud noise?

http://howtobyme.blogspot.in/2012/03/vehicle-making-clunk-thump-thud-noise.html

------------

4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

--------------

Heater makes clicking noise under dash on Ford Explorer?

http://technoanswers.blogspot.in/2012/01/heater-makes-clicking-noise-under-dash.html

---------------

Clicking noise under dash and front defroster not working?

http://technoanswers.blogspot.com/2012/01/clicking-noise-under-dash-and-front.html

------------------

Car Brakes Making Noise?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

---------------

Car Alternator making noise?

http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

-----------------

Car Alternator Bearing Makes Grinding noise?

http://repairhelpcenter.blogspot.com/2011/12/car-alternator-bearing-makes-grinding.html

----------------

Engine makes noise and Cooling Fan belt Breaks?

http://howtobyme.blogspot.com/2011/12/engine-makes-noise-and-cooling-fan-belt.html

--------------

Vehicle Makes Clicking Sound While Taking turns?

http://schematicsdiagram.blogspot.com/2011/12/vehicle-makes-clicking-sound-while.html

-------------

ABS light comes on and Car makes Grinding noise?

http://repairhelpcenter.blogspot.com/2012/01/abs-light-comes-on-and-car-makes.html

-----------

These will help.

Thanks.

The grinding noise you describe is a good indicator of the hubs. You seem like your right on the money with the issue,

Please - for safety sake take your vehicle to a shop.

you need to have the front end inspected those vans are notorious for idler arms

Assuming...you get the noise with the vehicle moving; try loading up one side at a time by doing lane changes when you hear the grind. If the noise increases & then decreases as you go from side to side then you probably have a bad wheel bearing. Also, You could just have a pebble caught between the backing plate & rotor! (they have a tendency to fall out quickly)

sounds like a possible wheel bearing issue or brake pad issue!!! i would definatly have this looked at, but in the meantime, make sure that it isnt just a backing plate contacting the rotor ...hope this was helpful!!

Up to you about grinding . Easier to drop tank and check all elctricals. Nephew didnt and had a short. Almost blew up. Had a similar problem with motor cutting off. My problem was a diode in the alternator