Elijah, I had a '71 Lincoln Mark III with Sure-Track 4-wheel anti-lock braking system. it was optional on all Lincolns from 1969-1979 but standard on all Mark series from 1971 through 1979. Don't know who was first. But, interesting bit of auto history on just how old this idea is. I remember first finding out about this feature. This was before the current crop of cars with ABS. I can't repeat the words I used here! :-) I haven't seen the Chrysler units. Must be a rare option. That makes it a "must have" for any Imperial owner! --MarkE