My problem is that the upper door hinge on my 2001 silverdo is bad i need too know how to remove the old factory hinge to replace it.

It will take 2 people to do this. First take a pry bar or a big screwdriver and pry out the spring that holds the door open. It is located on the upper hinge I believe. Next get a floor jack and a piece of 2x4 to support the door about mid way. Raise the jack so that the 2x4 just touches the bottom of the door. Next use a hammer to knock out the old hinge pins.(remember what way the pins came out. From top to bottom or bottom to top. They will be installed the same way they came out.) Have a friend balance the door on the jack as you move it away from the hinges about 2 or 3 inches. Before you knock out the bushings look closely at them and where they go because each hinge has 2 bushings and the hole in the bushings are different sizes. If you look at the pins you will notice that the pin diameter is larger at the head of the pin than at the end of the pin. Knock out the old bushings and install the new ones in their proper place. Put a little bit of grease on each bushing then move door back into place. Line up the holes and install the pins by hand until the pin is almost all the way in .Then use a hammer to drive the pin in until pin head is against hinge. Putting the spring back in is EXTREMELY DIFFICULT if you don't have the tool that's made for putting the spring back in. You might be able to borrow one at Pep Boys, AutoZone etc. Each door should take about half an hour to do. I hope this helps you out. Good luck. It will take 2 people to do this. First take a pry bar or a big screwdriver and pry out the spring that holds the door open. It is located on the upper hinge I believe. Next get a floor jack and a piece of 2x4 to support the door about mid way. Raise the jack so that the 2x4 just touches the bottom of the door. Next use a hammer to knock out the old hinge pins.(remember what way the pins came out. From top to bottom or bottom to top. They will be installed the same way they came out.) Have a friend balance the door on the jack as you move it away from the hinges about 2 or 3 inches. Before you knock out the bushings look closely at them and where they go because each hinge has 2 bushings and the hole in the bushings are different sizes. If you look at the pins you will notice that the pin diameter is larger at the head of the pin than at the end of the pin. Knock out the old bushings and install the new ones in their proper place. Put a little bit of grease on each bushing then move door back into place. Line up the holes and install the pins by hand until the pin is almost all the way in .Then use a hammer to drive the pin in until pin head is against hinge. Putting the spring back in is EXTREMELY DIFFICULT if you don't have the tool that's made for putting the spring back in. You might be able to borrow one at Pep Boys, AutoZone etc. Each door should take about half an hour to do. I hope this helps you out. Good luck.