Per the website, the bass tab to Jerry's part is:
G---9--9--9^11/9--7--7--------7-------7--9^11/9--7---7------
D---------------------------7h9-----7h9-----------------9--------
A-------------------------------------------------------------------
E-------------------------------------------------------------------
G---9--9--9^11/9--7--9--7-----9--7--9--7----------------------
D-----------------------------------------------9--7--9p7-----7---
A-----------------------------------------------------------10---10
E-------------------------------------------------------------------
That's actually what I've been playing... always kinda wondered about that.
I'm pretty sure what Phil is doing is a similar lick but up 5 frets.
G---13----13----13^14/13--11--11----------11----------11--13^14/13--11------11------
D--------------------------------------11h13------11h13-------------------------13----------
A------------------------------------------------------------------------------------------------
E------------------------------------------------------------------------------------------------
G---13----13----13^14/13--11---13---11-------13---11---13---11-----------------------------------------
D---------------------------------------------------------------------------13--11--13p11--------11----------
A-----------------------------------------------------------------------------------------------14------14------
E-----------------------------------------------------------------------------------------------------------------
Sorry if my tab is crude, I don't use it much. Those 14s or A Naturals are noteworthy - they are not 15s or A#s, as they would be in an exact transposition of Jerry's lick.
I'm not sure I agree with the last few notes and the little climbdown on the D string and below, but those are also are the part that I think sounds most authentic to the live versions if you muddle them together. For your purposes you could probably throw in whatever little climbdown works for you... Deadhead ears aren't going to complain if you don't perfectly nail a part that's only on the studio version of a tune.
I gave your Shakedown a listen on Myspace... good stuff! You guys are a tight band and you personally have a ton of groove! Very cool, I could dance happily to that all night long.