I stumbled across this while looking for a chord chart, the most GD bass tabs I've ever seen in one place. I do not vouch for their accuracy or usefulness or the safety of the site. Just thought I'd pass it along for the tab-seekers as it was not easy to find.
http://www.tabs-database.com/grateful-dead-bass.html
http://www.tabs-database.com/grateful-dead-bass.html