Humming with throttle?

Maybe worn gears in the transmission. Have you checked the gear oil level or changed it?

I was hoping it wasn't the tranny. Wishful thinking on my part. Thanks for the help. I got the car from my brother and he put a used tranny in it. That's why it was my first thought.

Maybe he didn't set the differential tolerances correctly...or could be a bad pinion mating. Check the setup before trashing the trans, as these noises are usually the diff.

I had a similar issue in my car. But it wasn't a humming. It was a vibration at low speeds. It wasn't super bad and it went away so I put it off. But it came back with vengeance. It got super bad. Through first and second gear is vibrated so much it shook my feet. So I had to cave even though I couldn't afford the repair. Got a really nice mega of to help me out. They put my car into the air and my cv joint was completely shot. Not even sure how I was driving. It looked like someone had torn it open. Thankfully I bought a warranty on this lemon and am getting my monies worth out of it. Symptoms I had. Vibrating shifter knob when accelerating through first and second gear. Sounded like a very loud clunking/knocking/vibration from under my feet (as the front drivers side was the torn one) Replaced both front cv axles and the boots. Problem Solved

Check that BOTH half-axles are fully pushed into the diff.