06 Chevy Silverado 1500 V-6 4.3l cranks won't start

need help bad folks. Truck has to be fixed by Thursday.
Here's the story. 3 weeks ago truck ran beautifully. I knew
battery was on last leg. A few nights of temps in the 20s
and battery was dead. I replaced it. Turned the key and
click....click.....click. I got my hammer and smacked the
starter a few times. I turned the key and it tried to crank but
starter froze up. I replaced starter. I turn the key and motor
turns over but will not crank. It has spark. It has fuel. It has
no life. I've had both the battery and starter tested since
installing them....all good. I cleaned all electric contact
points on terminal cables and starter wires. It made the
truck turn over better but still no luck. I was told it's a
possible crank sensor issue by one of the very few people
that has the intelligence to offer valid opinions. After
getting the run-around from Google and YouTube about
location of Crankshaft Position Sensor I finally found it but
was told that since the truck is getting spark that it was not
going to be the sensor. I still have sensor and thinking im
gonna swap that as well just in case unless I learn
otherwise here.
I'm a 20 year experienced carpenter. Im not an expert
mechanic... and not having the knowledge I need means I
have to rely on the help of others, which generally speaking
is hard for me to do. I have the ability to do anything
needed. I just don't have the knowledge to troubleshoot and
pinpoint EXACT issue. I ordered a scanner last night and it
gets here tomorrow, but there are no lights illuminated on
dash board to indicate that a code may be waiting.
I've only had truck 2 months. It's my first Chevy Truck. It
may very well be my last if I can't resolve this issue. Please
Help.thanks