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GMC Yukon Questions

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Recently got an oil change and a new battery no when I hit a bump or press the brakes paddle the radio changes station
on star cant diagnose the problem since radio doesn't turn on . already tried shutting car roff locking doors wait 4 min go back in car turn it on still no radio or on star booth green and red on star buttons not working
The problem occurs always
Oil looks like brown mud and truck has no pressure
A ticking noise when starting up
I was shifting gear to back up and suddenly was not able to shift gear and the gear shift lever seems loose and will not shift to any other gear and seems to be stuck in drive
no fuse panel cover to indicate location of brake light fuse
Okay, so this is the third forum I've tried, so hopefully third time's the charm. My problem is this: My 1996 GMC Yukon 4x4 selector lights (push button) all come on, including the Neutral light (even when the vehicle is not in Neutral). I have checked the fuses, I even swapped the 4x4 fuse for good measure. The buttons do nothing when pressed (no change in lights, no sound from underneath the truck, etc., so I'm thinking that this may be an electrical issue rather than mechanical).

Any help or at least a push in the right direction would be appreciated. I plan to turn this Yukon into a project mud/offroad truck, and obviously wouldn't get very far without 4x4!
I want to adjust my seat settings myself and they not move or change settings when I get out of auto.
It makes a grinding, louder than if it were pads it also feels like something is a loose and wants to fall from up under the car when I drive it
I've never had a problem with my a/c until I picked it up from the repair shop this past week. My 2005 Yukon has the Auto Tri-Zone A/C & Heat feature. I took it into dealership to have the 3-2 solenoid they said the hole casing/harness had to be replaced in the transmission which I don't know about but anyway I had them replace the filter. My Yukon has 105000 miles on it. I didn't want them to replace the fluid because nothing was wrong with it and I thought it would cause more problems so they took half out so they could do the repair and then refilled and that was all. Now the front A/c in my Yukon does not function right. the back works just as it always has and it very cold and is working properly. When the front does work it works at all levels (can be turned high and low speed) and is very cold as usual but doesn't always turn on and once the driver side vent didn't work but all other vents worked. when it does eventually decide to work as I'm driving in the 100 degree weather it comes on full blast on auto and I can then turn it down and direct the air flow from auto to blow through the vents and the floor board vents as well. When I called to let the dealership know that they needed to fix the a/c that they must have hit something they told me it would cost me 300 for them to look at it and could cost additional in parts and labor to fix. I was floored. Can someone please tell me if this was just a bad timing for me or did the repair shop do this? I kind of feel as though I'm getting overcharged but if not then I'm willing to pay. I just forked out $800 for the 3-2 solenoid and filter replacement.
The noise happens when turning, parking and backing up. Seems noise is around torsion bars.
Dealer is quoting possibly 3gs
The oil level is always full but the oil pressure gauge is always fluctuating between 20 and 40. None of the dash lights are on. So I don't know what to do. The tapping sounds a bomb ticking.
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