2003 Chevrolet Silverado 1500 Questions

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2003 Silverado 1500 had rear main seal replaced and ever since then there has been this noise coming from behind the dash that is a constant, almost metal on metal sound. The sound is loudest on drivers side and I can't hear it outside the car with the hood up. I thought it might be the heater core but it's not a gurgling sound, more of this low metal on metal or constant rushing air sound. It's been like this for almost a year and doesn't seem to change the performance of the truck at all. I believe they left the engine in for the replacement. When I picked it up the tranny fluid was almost empty and the car wouldn't shift out of 1st. I got halfway down the street and turned around. So who knows what they did. Thanks for any suggestions.
Replaced sensor closest to the cab driver side with brand new nipindesor. Drove over 1500 miles computer still not reading but sensors are all working hooked up to a computer and it shows it gone through drive cycle what next
Will not start all gauges are working show symbol of truck locked down
I usually hear it in the morning when I start to work. It starts when I get up to about 40mph and lasts about 1/2 to 3/4 of a mile. It sounds like it is coming from engine compartment. It will buzz for a couple seconds then stop for a few seconds then buzz again. It kinda sounds like something is trying to kick on. When I start home, it does it a few times then stops. It's a V6 with approximately 175000 miles.
4x4 actuator switch is not lighting up.
My truck seems to only start when it feels like it, lately it will start after about 5 to 10 tries. Any advice which part it could be?
My running lights on my 2003 Chevrolet Silverado 1500 LS work but when i press on the brakes only one gets brighter.
2003 chevy silverado 1500 4.8 V-8 LT no start no crank new battery new starter power to starter not solenoid
Exhaust and starter was damaged from hurricane harvey.

Brand new catalytic converters.
4 new O2 sensors.
New starter.

Ran great for 3 weeks.
Sat for 2 days then wouldn't start.

Fuel system good.
Getting good spark before distributor.
New rotor on distributor.

Still won't start.

died. tried to start and would start for about 2 seconds then die. Now will not start at all. Just cranks nd still nothing on the dash.
2003 will not shift to 2 or 3 gears
Never had a problem before i was told it needs to be coded
where is the oil pressure sensor located on the engine
He is providing all parts, fluids and a garage. I'm using my own tools, traveling about 20 miles (one way) to his house and doing all labor including paying a friend 100 dollars to help. What would a fair price be. Any thoughts? It's a 4x4 too.
I have an 03 chevy Z71 that the 4wd doesn't work the light stays on 2wd just put a new achuator in the front end and till says service 4wd help.
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