tell me now i can not answer this qestion because you will not tell me but i know some of it it is
There should be a vacuum hose diagram on the front of the driver side strut tower.
The vacuum diagram is on a sticker located on the hood underside or on the front radiator support cover
diagram from front vacuum motor to transfer case of 1993 Jeep Wrangler
The vacuum diagram is located on a decal on the under side of the hood towards the front of the car. If it is missing you will have to buy a manual.
On the underside of the hood near the front there is a diagram of your vacuum hoses and where they go.
On the l987 Chevrolet Celebrity with 2.8L V6 the vacuum line diagram is located on the front of the passenger side strut tower.
A diagram should be affixed to the underside of the hood, toward the front, and on the right side.
The automatic hubs are activated by vacuum. Check for broken or disconnected vacuum lines especially behind each front wheel.
There should be a sticker located on the front end of your jeep along side the hood latch with the vacuum hose diagram. If you do not see it there, it will depend on the year as to what diagram you need.
Yes, the front diff is vacuum activated, but you can look online for a cable retrofit kit to engage the front diff without vacuum pressure.
I have a 1982 cutlass supreme and the diagram in under the hood on a front panel, If not someone may have removed it.
The diagram should be located under your hood on your front cross member