Got lucky last week. Found a dude out in Hayward with a trans from an 06 with less than 20k on it. Swapped in in this weekend and shifts like a dream now. In comparison, my old box was trashed; noisy as hell at speed, 2nd gear basically gone with 3rd and 4th going.
Got all the parts to build the grid charger. Need to pop into Radio Shack for some odds and ends, but I'm hoping to have that wired up in the next day or so.