guys i need help my 4x4 still doesnt work. i think i narrowed it down to some kind of vacuum i guess. i have a good working actuator, the front drive shaft locks when i have the blazer in 4H and the fuse doesnt pop any more like it used to.

i dnt know where or what else to look for. please help me out with any ideas. i dont have a push button 4x4 i have the lever on the floor. and well idk what else would yall want to know? if yall have any questions about my situation please let me knw thank you!