2008 Chevrolet Silverado 1500 Questions

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sometimes(very rare) in forward or reverse when turning from stop i get a banging like skiping a tooth-then corrects when i get going.looks like excessive play in differential when i checked it.could i need pinion gear and other gears in rear end?
this has happened 2 times before and shop plugged a divice in under my steering wheel and reset the Trans code. What was the dive called and how much are they?????????????
cooling fan does not come on until temperature gauge hits 240 degrees, or if I turn AC on it will cool the running temperature to 210/220 Have had radiator replaced and dealer says this is normal.
I flushed the coolant and when I refilled it, it won't cycle through. Must be air in the lines but I can't get it out. Any tips to get it to go through the lines?
po449 code is on and have checked selonoid and it clicks when checked with a 12 volt battery? please help if possible
Going down the road at around 65 mph and 4 times in a row the truck completely lost power and kicked back on doors unlocked and locked radio kept powering off when I hit the brakes or turned on turn signal all lights on dash were on during the stallings engine even shut off but kicked back on and then after that the truck started shifting hard from 1st gear into 2nd.
Replaced ignition cylinder, New key, new transceiver, nothing works
Okay so I'm really having a hard time with this. I
have a 2008 Chevy Silverado, and when I start it
(sometimes) it makes a grinding noise like
something isn't catching like it's supposed to. I
replaced the alternator and got a new battery. The
only thing I can think of is the starter, but every time
I take it to get tested they tell me the starter passed
the test. I don't want to take it to the dealership
unless I absolutely have to. I'm sitting on about
170,000 miles. Any kind of insight will help.
Sometimes the radio or the CD player volume is so low and cannot be adjusted while driving. They both work, but no volume from the speakers, front and rear.
Most of the time they are very low. Sometimes it works normal. Also seems to mess with the speakers on the drivers side. Help!
I have a 4.8L 2008 Silverado LS with approximately 145,000 miles. Recently it started revving high in 1st gear and would NOT shift until I let out of the throttle. It revvs between 3000 and 4500 rpm's before it shifts regardless of speed. Just two days ago, after driving it for 30 minutes, letting it sit for about 30 minutes and restarting it - The ignition was delayed, and when it finally fired, it shuttered. Like it wasn't getting air or fuel. Up until this point, my check engine light had been on. When it shuttered, the check engine light went off, but I still have the same issue.

There is also acceleration lag in the other gears. When it goes into the passing gear, it revvs to 5000 rpms and lurches - I really try not to let it go to the passing gear.

I've replaced the evap emissions sensor, the throttle control sensor (but not the entire throttle body), and the throttle position sensor. At this point, I feel like it may be a vacuum issue somewhere or possibly electrical. What the heck is going on with my truck? Thoughts? Suggestions? I don't want to keep throwing money at it and hope it resolves the issue. I've seen similar issues for trucks from the late 90's to 2007, but don't want to assume the same fixes apply here.
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