Transferase engages in to four wheel high but not four wheel low?

Hi,

If it will shift into 4wd high but not low, it could be a couple things. For example, it could be the mode switch or the shift motor itself.

To diagnose this, I have attached the directions below which also include a description of how it works. However, it does require a scan tool to perform the tests.

Take a look through them and let me know if you are comfortable performing them.

Take care,

Joe

See pics below.