If you want to retain the TH400, and you know its history then I'll say GV. I bought my GV used on ebay for half the cost of the new one (check CL as well). Installation was simple, took me one weekend. One note though, the GV made a clunking sound when shifts out of OD (was told it's normal). Sounded OK if you're moving slow enough. Sold it when I did the LS/4l60e swap.
Now if you want to go manual, then T-56 all the way.
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