I have a 1999 silverado 2500, not sure which transfer case as of yet. It has push button 4wd drive. I click into 4hi and 4lo, and i can hear the transfer case shift. when i drive in 4lo, i can definitly tell that i'm engaged into 4lo. however i have no power at the front wheels. I have no lights for service 4wd on the dash I can do mostly all mechanical work, just trying to find someone that ran into this before. any help would help.