Hey guys, I have a 98 blazer 4 door 4x4. Well im having trouble with switching into 4 hi and actuallly the bigger problem is that I can switch into 4 lo but when i do go into 4 lo it feels like my tranny keeps coming in and out of gear and my whole truck is jerking and makes a bad grinding noise. when i press the 4 hi, both hi and lo blink and just go back into 2. my orginial switch broke and its been broken and when i put the new switch back today it started doing this. any help?