Was wondering if anyone might have any ideas about what to check if my 4 wheel low does not engage. I have a 94 EB with 351 . I can get the 4wheel to engage but when i hit the low button nothing happens. The truck has only 100k on her and has been very well cared for not many 4x4 trips but engaged occasionally to keep things turning. also if there is any maintenance i should do to her at this stage please chime in. thanks for any help.

 

Truck needs to be stopped and in Neutral in order to shift into 4Low.