good day everyone, first of all I greet everyone from hot Dubai. I am a proud owner of this car, I am very happy with the car, but lately I have a problem that I should fix. I text first to all of you in the hope that you will help me. I've flipped through most of the topics and I guess what might be a problem, but sure experts here can give me some advice. car information: GMC Terrain GCC specs, 2015 Denali option, 120k km. engine 3.6 AWD automatic. in recent months every morning in the cold (engine temp) when I start the car and start driving I have grinding sounds that are heard louder when the car accelerates in the first few gears. by the sound I think it's somewhere in the front of the car, almost I'm sure it is. the sound is like scraping metal from metal, like there is no oil in engine and the oil has been checked. there is enough oil in the engine, a few days ago I changed the transmission fluid, and I changed the transfer case oil counting that it may be too little oil or that it is time to change. after the car reaches operating temperature, this sound is no longer heard when accelerating from the zero, it is not heard. I also think that in the morning when I turn on the cold and drive the car immediately, and turn to one side or the other, that sound is heard louder, which is also almost not heard in a similar drive after the car is warmed up. do you think the problem is a transfer case and needs to be changed? I ask because car maintenance here in an authorized service center is extremely expensive, and in private garages I don't really trust them, and they can also list parts of cars that work quite normally, that they were damaged just to get as much money as possible. I hope for your help, to at least reduce the choice of what to pay attention to. thank you all for any help. greetings from a Croatian guy living in Dubai.