Grinding noise underneath car

Transmission, when shifting feels like it's not engaged all the way. \nTwo thousand one chevy suburban fifteen hundred

I get nothing when I turn key to absolutely nothing I have little power some lights on dash are on.doors keep trying to lock and unlock when I turn the key off and weird odd noises sometimes. I tried all kinds of things check fuses another batter now I get no power at all

Obd not coming on when you plug it in

Driving on fwy after a traffic slow down, truck would not go faster than 25 mpg. RPM's would go high but no speed. Replaced trany filter and gasket, 1-2, 3-4 & 3-2 solenoids, trany valve position pressure switch, torque converter modulation valve and throttle position sensor. Replace TCM w/rebuild. No codes on dash. No luck issue persists. If press hard on gas pedal it feels like if it goes into a gear but then revs up and goes back to second.

Transmission not downshifting

Passenger side tire pressures will not come up on dashboard says service tire pressure monitor system
Four-wheel drive will not switch on stays in two wheel drive says service four-wheel drive on dash

Only has 1st and reverse no other gears transmission fluid is brown