i want to know y my friends 1996 chevy lumina wont move when in drive i think that gear is blown

It is common for the 4T60e to loose drive. But it should automatically shift to 1st or 2nd when in D or OD to get going then slip. If you put it in 1st or 2nd will it move. There could be issues with the shifting solenoids or pressure regulator. If it has been slowly failing then stopped it will need to be replaced or rebuilt. If it stopped suddenly it might be repairable. However the valve body is on the drivers side of the 60 behind the cover and cannot be access without dropping the tranny out of the car. Most early w-body cars will have a 60e (the supercharged cars have a 65) but if you look at used ones make sure you can test them. 80% will have atleast something wrong with them. Lucked out on by '95 Monte (2 door Lumina) found a car with a blown motor for 300 bucks with a good tranny rebuilt by a GM certified shop.