hey whats up i have a 2002 chevy silverado stuck in 4 low, i can hear the transfer case shift and the buttons on dash work, the differential it out, but when i drive i can tell its in 4 low and shifts hard or doesnt shift at all just revs and after a minute of driving it will shift, also sometimes when driving down the road it will switch from 4low to 2 hi on dash switch and i hear a nasty grind but its still in 4 low. i shut off truck and turn it on and switch button to 4 high. i havent been driving it alot just down the street going 10- 15 mph.. this is my first truck so help if its better txt or call me 2103241781 thanks