1996 GMC Jimmy 4X4

Ok you hear a noise in the dash and a noise under the truck. There will be two noises under the truck one puts the transfer case into gear the other locks the fromt axle. Raise rear axle let truck idle in 4x4 look under truck is front shaft moveing if yes the 4x4 motor on the front axle is not working remove dissasemble clean lube reinstall. If the shaft does not turn do this same procedure on the elec motor on trans case. Good luck billymac