Can someone please give me some advice? I have a 2005 LE crew 4X4 with 125k on the clock. Just yesterday, I noticed a popping/clicking/whirring sound in the rear-end. I've gotten under the truck and the only thing I noticed is some grease or something oozing from the driver's rear wheel area. I checked the rear-end to see if it was hot, thinking maybe the fluid was low. It was not hot to the touch. I'll be checking the fluid level this afternoon. I have parked the truck until I can get some info. Does anyone have any insight as to what else I might be able to check? Any help with this is greatly appreciated.