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strangely I cannot find the 4 pronged connector for the lock up on this transmission, I thought by now all the Th350's were lock up...
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No, none of the TH-350's, or 400's ever had lockup. The TH-700R4, 4L60, and 4L60-E are all basically the same transmission with improvements, especially the 4L60-E, but in a nutshell, are "simply the turbo 350 with overdrive." Same goes for the TH-400 and the 4L80-E... except the "E" means fully electronic controlled as in the 4L60-E.
In terms of the other questions you have, I'm not positive, and I'm sure there's others here that will have more concrete information, but here goes: If I remember correctly you will need a different crossmember, and a different driveshaft, both that can be found at a junk yard from another Caprice with the same rear end. Your shifter will work just fine, the needle will just go further than normal if you put the tranny into 1st gear (D1).