We've had a couple of Packard 12s in the family and still have one, but the ongoing 40 year long restoration seems to have gone over schedule so I can't comment on driving one. I've always liked the Pierce Arrow, although I've never driven one of those either. I'm wondering how the overdrive gear worked on the Pierce? Was the unit integral with the transmission or mounted behind it. Does it work on all 3 gears or is it like Mercedes where it's an over the top gear off of 3rd?