Still kind of new here but I could use some help. Just changed a front axle seal on my hjz77, it was changed from electric hubs to manual and now I have a problem with the 4wd. When the hubs are locked and I am at a dead stop 4wd will engage fine, but when I am driving it will not engage on the fly all I hear is grinding almost like one hub is not fully locked. Any ideas or am I pulling it apart again?