2002 jeep grand cherokee laredo v8

just came back from a 600 km trip highway driving and as i get home it started raining crazy parked vehicle at friends for about 4 hours then as im leaving and started it up i heard an awful grinding from the passenger side more from front end turned off vehicle then started up again and same thing.

the crazy idea is that im in park while hear and as i slow down i hear it
only changes i have done recently before the trip was
NEW= caliper, routers and pads around all four wheel any ideas what it could be?

 

Have you looked at your pulleys on the engine? Making sure nothing is jammed up in there, ya never know.

 

so i left one thing out but i added a k&n cold air intake to my jeep and i had a friend of mine under the jeep while i started and rev and it was the catilac convert vibbing so he held it with his foot and it stopped