2006 chevy 2500 duramax 4×4. Got stuck today in 4×4 high. Noticed that front drivers tire was not spinning. Got out before going into 4×4 low. Not long after I got the truck I know that all four tires would spin in 4×4 low. Never checked in 4×4 high. Do I have a problem? Am not sure now if all four are spinning in 4×4 low. Will check tomorrow.