Were there any TRUE 904 lockup's ?

TrailBeast said

I remember the nasty dash shudder those caused and how it scared the crap out of people.
When was that, somewhere around the mid to late 70's?

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Don't know positively it was the first year but a buddy of mine had a 77 Fury that did the shudder. If I remember right lockup came in around 35 mph and with the hwy gears those cars had it was waaaaay too soon IMO