93 chevy g30 van auto trans wont change gears and speedometer jumps up and down

SOURCE: 1982 G30 Chevy Van power steering fluid

Find the power steering pump. The fluid goes in the top of the pump. Look for a twist off cap that has a measuring stick attached to the under side, when you take it off. Make sure you use the correct type of fuild for YOUR kind of vehicle. There are diffrent types for different makes of vehicles. Don't OVERFILL the pump.

SOURCE: 1995 chevy g30 van

If vehicle was left outside or in an unheated garage, there is a strong possibility that condensation has contaminated your fuel. Easiest way to check is to remove fuel filter and pour contents into a glass jar. If you see two different layers of liquid in the jar, the bottom part is water. Replace with new filter and drop the tank. Remove sending unit. pour contents into a large container and clean out inside with clean dry rags. Remember, fuel is dangerous to work with and fumes travel pretty far on the ground. So, no open flames electrical stuff, cigarettes etc for a good perimeter around work area. Generally, you can re-use top 3/4 of fuel you removed by syphon. Don't use remainder in your vehicle. Part can be used for lawnmower etc as long as you only take the part above the water line.

SOURCE: 2000 Chevy Prizm Lsi 4-speed auto trans. problems

That does sound like a linkage adjustment problem.

If that does not work, I'd try a fluid change and filter. But your diagnostics with pulling on the gear shifter is a pretty good indication of a linkage problem.

SOURCE: the speedometer stop working on my 1982 chevy g30 van.

that would be the first plavce i checked and the cable runs from the transmission to the dash and its a real hassle to get to and install I would get a chilton manual to show you how to get to the connections the easiest way, you can also get a repair manual at your local library

Testimonial: "Thanks, i'll get a repair manual and go from there."

SOURCE: i have a chevy 93 astro van my transmission won't

If the van is an all power, Have your alternator checked. DO NOT remove battery cable while running to check alternator. You definitely will need a new one then. they are sensitive to voltage changes, if voltage drops much will lock auto trans in 1st gear & various others things will stop working that draw much juice. Anything under 11.7 volts will trigger trans lock into gear on these vans. Autozone & O'Reillys checks them for free if you bring it to them.