2005 GMC Sierra 1500 Questions

All 2005 GMC Sierra 1500 Questions

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I lose coolant frequently but I have no leaks,I also lose oil with no leaks.
leaks water on drivers side when it rains from under the dash
TO AVOID HAVING TO DEAL WITH THE 4X4 KICKING IN AND OUT
Will run on either.gas gauge reads empty with full tank.fuel pump won't run. No signal to fuel injectors. Ran fine turned off 5 min later no run. Gas gauge was working, now not. New fuel pump done, no luck. Fuel pump ...
The truck went into neutral going down the road. I coasted to the side ofr the road and tried to put it in park, I heard this God awful grinding noise, like you are shifting a standard without pushing the clutch in. I...
It doesn't happen at any specific time,has happened in the summer as well as in the winter.
It just started one day I walked outside and both of the fans were runnin when my truck was off and it caused my battery to run dead. When I hooked jumper cables to it as soon as it got a little power the fans started...
When coming out off highway speed to city speed transmission isn't shifting down, and what happens is that when i accelerate again from a complete stop i here my rear end differential knock hard (like its still it top...
just happened while on dirt road - no diagnostic codes show. Good fuel pressure
When i start my truck i can lock it into 4wd but if i drive for a minute it will read service 4wd and if i try to lock it in the lights just keep blinking? Changed already actuator fluids whats next help people??