Hi i have a 2008 1500 sxt. I recently had new tires installed. Oem size and all are matching. After i left the shop i noticed that the cruise control would not come on. No light on the dash. Also my 4wd will not engage. I switch it to 4wd and it makes a brief clicking noise and 4wd light flashes. Tried to go to 4l and it makes grinding noise. Back to 2wd worse grinding noise and also seems to be a power strain as my lights dim during this. All the while my 4wd or 4l light just flashes. I believe the transfer case shift motor is junk but how do i know for sure? Truck has approx 170k on it. TIA for any help given