Engine noise

That engine is going to be a buzzy little beast at 3K. But it does not produce peak torque until over 4,000 rpm. I would say 3,000 at 75 mph is probably about right.

Noise wise, you could have a small exhaust leak or a heat shield that rattles or a number of other things. If it concerns you take it to a shop and have them take a listen. As for shifting, go out on the highway and slowly accelerate and count the shifts. That is a 4 speed trans so you should hear/feel 4 "shifts" 1-2, 2-3, 3-4, 4th converter lock up. I suspect it's fine though.

GM extended the warranty on that transmission to 10 years 120,000 miles because of the shifter cable issues. Then recalled them to replace the cable.

You are very welcome.

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