I don't have much experience with fron wheel drive vehicles but if your gear box was the problem you would hear a distinct diference in the sound from coasting to applying power. If there was no diference then my guess would be a wheel bearing. Good luck
I just ordered a Multi-fold aluminum ramp (9' x 30", 600 lb capacity) from Discount Ranps, $360. It breaks into 2 pieces (side by side) and collapses telescopically. I'm using it for a power wheel chair. The model is "DWR-9".