Where is the crankshaft position sensor located is it above the starter note it is a slt w Vin code ,or vortex engine a 4.3l

Hello, why are you seeking it? If there is a code setting referring to that circuit, it's often due to a loss of signal from an engine stall -- not as a cause of failure of the sensor. Perform necessary testing, and don't knee-jerk replace a crankshaft position sensor. They can fail - like anything else, but it's much more unusual compared to other causes. www.repairpal.com/repair-shops