1930 Essex with the 161c six L-head engine. After working on the carburetion of this engine for quite awhile I finally have it running better than it has for some years. Having done that, one problem I've always had with this car is I've never been able to go over 30 mph as I get a vibration that makes you want to take your foot off the accelerator. I'm not sure it will go a whole lot faster with the rear end ratio they had in these cars back then, this one is 5.1 to 1. I'm just hoping to just feel more comfortable at maybe 35-40. I have noticed the vibration in the steering wheel in general but it does not oscillate back and forth. But I also feel it in the seat. Pushing in the clutch does not affect it, still there. I replaced the kingpins recently with no play. I had a driveshaft with modern universal joints made also some time ago. So I'm hoping someone can steer me in the right direction on what could be th most likely culprit. Wheel bearings, axle bearings, unbalanced tires, transmission? It's approaching miserable in my unheated garage so I don't know how much time I have left to look into this but whatever guidance I can get is great.