The transfer case shifter on my '89 Blazer only moves between 2H and 4H (it won't go into neutral or 4L). The problem's definitely the shifter, not the transfer case. The linkage between the two is fine. Is there some "trick" to getting it to go into 4L? I've tried pushing down on the knob, pulling up on it, making sure the transmission is in low gear, neutral, park, etc., but no luck. I'm thinking maybe something is jammed up, but before I take the shifter apart I wanted to make sure I'm not just doing something wrong. TIA.