Grinding noise when you put the car in drive 1,2, and reverse. car will still move and run

SOURCE: Transmission???

It's hard to say for sure what the problem is, but there are a few things to consider. One, you may have a bad TCU (transmission control unit) - a friend has this issue on an Audi A4. You move the gear selector to put the car in gear, but the TCU isn't responding right and isn't doing what you tell it to do.

Another idea is that your transmission fluid is low or bad, or the filter is clogged. That's a fairly inexpensive and easy thing to take care of, and might not be a bad idea anyhow, seeing as how the car is just under 9 model years old.

A third possibility is that the sensors under the console where the shifter is mounted are bad, and aren't sensing when you move the gear selector. I'm not sure how to diagnose that other than to install new ones (or ones out of a salvaged car), but contact Nissan to see if their OBD2 diagnostics include chassis and powertrain fault scanning - if they do, they should be able to detect a code in the system that will point toward a faulty component.

SOURCE: the car doesn't go forward or reverse when i move the gear stick.

check if it has any oil in he gear box.

SOURCE: 1991 Caprice No reverse. Moves in neutral. All forward gears OK.

This is Ron out of Vero Beach Florida. I have been doing trannys for years. The problem you described is caused (more than likely) by a seized clutch pack. Depending on the trans, and your car should be RWD with a 700r4 tranny, there are several sets of clutch packs and at least one band. Automatic transmissions rely on fluid pressure to "engage" the correct set of clutch discs, at the right time , to engage and change gears. I have seen in the past, where a customer parks his car for the evening and the next morning, no move. What happened?? More than likely, a clutch pack was on it\'s way out but cause the car was hot the plates were free, but after cooling, they can weld themselves together and actually "lock-up". In the morning you know the end result. Your tip on "moves in Nuetral" is the give away. Ron