OK well like it says my front axle won't lock in. Transfercase is fully functioning 2- 4lo . I can hear it shifting and it's for sure going into low range. Front spider actuator gear has been .
replaced!

It's a 98 4door

 

Sounds like a vacuum problem. Could be the diaphragm under the battery tray. (I think its located under the battery tray in your 98.

 

Yes it is