You can remove the center plastics and get to the shifter rod to adjust it....however if it doesn't go into low range at all, and you feel the detent for it..and nothing there, it's likely there is some internal problem. These frames bend and flex so much and the engines being rubber mounted, they never should have use a solid link like a rod between the engine and shifter. In the right conditions, like rock crawling, that could have pushed or pulled on the transmission shifting barrow enough to move it partly out of gear under load and cause it to separate breaking parts or push it hard enough to break something. Really hoping it's just an adjust for you.