Need one hell of a lot more information then this
If it is working it is OK, look elswhere for your problem, the transfer case might not be engaging but i can't help you with that.
The 4x4 actuator is screewed into the front differential housing towards the passanger side, It has electric wires going to it,
electric actuator (range selector)
There is either a problem with the actuator in the front differential--BAD ACTUATOR. Are there is a problem with the differential ---RING and PINION asembley.
NO it don't. The actuator is up on the front axel housing. Now the transfur case does have a switch on it that sends power to the actuator up front.
It does not have one. It has a 4x4 Actuator in the front housing.
Need to check are replace the 4x4 actuator in the FRONT differential.
It is screewed into the front Differential, towards passenger side but in the middle of the housing.
what weight of oil do i use in my 1994 Chevy astro all wheel drive differential and transfer case
the air pump is on the back of the front bumper, the rest in your front axil inbtween you ring gear and your carrier
It is located on the transfer case. It'll be on the drivers side of the transfer cas, right next to the front drive shaft, in about the middle of the vehicle! Good luck , it is a hard to get out!
Need to check the front4x4 actuator on the front housing to see if its working. there is a switch on the top of the transfur case that sends power to the front actuator to ingage 4x4