where is the crankshaft sensor on 5.3

I have a 2000 silverado 5.3 and would like to change the crankshaft sensor please tell me where is it on the engine ....thanks Bob

it is behind the starter
 

Thanks GM Tech would you say it reachable for a non pro and I do have have a code reader would I need anything else...Thanks Bob

You should be able to do it, if you know how to change a starter then you will have no problems

Thanks GM Tech