More woes to my beloved. This might be tied down to my tranny but the vibration is apparent in this RPM range in every gear. It's easy to spot in the first 3 gears because I can maintain the specified RPM range. The vibration doesn't quite pass through the cabin and I can definitely feel it being external. Engine mounts? Diff? Any clues what it is?

 

Can you hear any noises from under the hood? Like whines maybe coming from pulleys, tensioners, etc?

 

1st gear has slight whine, but that's about it. It's weird because it vibration is only felt in the specified rpm range.