Last night my buddies and I went down to the beach to do some surfcasting. When I was on the ramp to drive on the beach I switched over to 4-HI. It hesitated then said "Check 4X4". it went into 4 wheel but had the wrench in orange on the dash. It was a beast on the sand, the 35" nitto's helped I guess. I didn't even have to air down. After we were done when we were on the pavement I clicked back to 2 wheel. It didn't switch back, so I went back to 4 Hi and the only thing it was saying was check 4X4. Then once again I switched back to 2 wheel and it made a grinding noise, then went to 2 wheel. It runs great now with no problems, im just worried about the next time I need 4X4. Im going to bring it to the dealer when I hit 3000 miles for the first service, however I only have 2200 right now on the truck. Should I not worry about it and wait, or do you guys recommend bringing it in now?