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When making any changes to a car, it is important to have a diagram for a guide. A diagram for a 1987 GMC Jimmy vacuum hose system can be found in its manual.
need vacuum pump to remove all moisture and contaminants in system
Sometimes it can be as simple as looking for a hose to that has come off or a broken fitting. This can be done by isolating different areas in the system. If the above fails you need to measure the vacuum with a vacuum gauge. While the truck is running or how fast the vacuum dissipates when the engine is shut down. Then you use a MityVac (small hand held vac pump) to measure the different areas where the vacuum is supplied and fix the leak when you find it.
Take out the battery and the battery tray. Its underneath the two on my jimmy.
www.the12volt.com go to the diagrams section...
both, front engages by vacuum, transfer case is electronicaly shifted
Looking for Jimmy - 2002 is rated/received certificates of: France:U
check your charcoal canister, or evaporative purge system for a broken or missing vacuum line
Inside the Driver's Side Fender
The best place to find the diagram for the rear differential on a 2000 GMC Jimmy is at the dealer. The dealer carries diagrams and manuals for all the the repair work.
The availability of diagrams will depend on a few variables including the year of your vehicle and how much of the vehicle is factory original. For original equipment diagrams, check your local auto parts stores for repair books for your specific vehicle published by companies such as Chilton's or Haynes. The books will cost, but provide a plethora of information that can be used now and alter. A local library may have the books in their reference section. You may also order or download many repair manuals and individual diagrams online.