Cannot Shift below Drive

[Kansas GX470]

I just purchased an '05 GX470 with 147K.  I am having a few things repaired:  New alternator, new master cylinder and the timing belt.  I have noticed that it will not shift below Drive with the gear selector.  I can go from Park to Reverse and on to Drive but I cannot go lower.  The transmission seems to shift fine, actually quite smooth.  The 4x shift works well and does go into low gears.  The the center differential appears to be working.  I know there is a release switch in case the vehicle gets hung up in Park.....but that is not my issue.  If you have an ideas or solutions, please comment.

[Harley Rider]

Similar problem, though I can go down to 4th gear, and if I struggle, I can get down to 3rd, but no lower. Linkage is fine at the shifter and at the trans. My mechanic said the shift cable is binding up.