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GMC Yukon Denali Questions

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i tried to swich off and reswich it on again but still nothing change, tried to check oils also every thing is fine. i dont know why gear not shifting to down to R or N ..ect. be noted that the gear's arm is moving but not stuck in the any level.
i have tried to change key switch door button wiring harness door switches nothing has worked so far
It always works at first but then stops once it gets warm.
All of sudden while driving yesterday I heard a loud grinding noise and thought maybe the driver wheel had popped off...after stopping the wheel was still on but when I put the truck back in gear to drive it makes a very loud grinding noise.
Terrible shaking when brakes are applied. Front left caliper and rotor replaced. Both back rotors replaced, but not pads. Still shaking. If pads in back are replaced will this stop the shaking?
When opened manually it closes prematurely. What's likely happening?
I've replaced Vavle cover and I'm worried about a Rear main seal leak vs Oil Pan Gasket vs. Crankpressure vs. Timing Cover issue.

Any advice on how to investigate and fix this in a cost effective manner would be greatly appreciated.
I plugged in a computer charger, worked briefly but then stopped... Other sockets in dash and back work fine. How to fix?
The speedometer or other instrument panel gauge may begin to work erratically at times
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