'08 Buick LaCrosse.
Vehicle shakes when hitting the gas between 35 and 45 mph. No shake when braking down through these speeds. No shake when in neutral revving the engine. No wheel shake as one would expect with warped rotors. Re-balanced and rotated the tires (they aren’t even that old anyway), still shakes. Below 35 mph, no shake. Vroom past 45 mph, buttery smooth.
Is this an alignment thing? Struts? What am I looking for? Salvage title car. No idea why. It was cheap and I use it for a rural mail route. Had the car for 40,000ish miles. Just the most recent issue in a long string of issues. I do as much of my own maintenance as possible to keep it profitable but this one is stumping me a bit.