Bogie, I generally digest your comments and have learned a lot from you.... I thoroughly respect nearly everything you do to help out those of us who are old but still learning. However, there are two things you mentioned in the previous post that we should clarify. The first is, depending on the personality of the owner of the vehicle in question (old and likes to drive like an ordinary old person, all the way to a twenty-two year old idiot that endangers other's lives every time he/she gets behind the wheel), the favorability and usefulness of a 2,3,4 lockup may or may not apply to the list of choices for the owner. For instance, nobody needs to buy a "kit" to have selectable shifting modes. The only thing one needs is a two wire 4th gear pressure switch, a three position toggle switch (on/off/on) and some wire and terminals. Early 700R4's had an external pressure switch port that could be used without pulling the pan for installation, but in about '88 or '89, the ports were deleted, and the 4th pressure switch is mounted internally on the valve body. I have read that you can "drill a hole and tap it" in the side of the transmission to mount a switch externally, but I surely wouldn't do that..
I happen to LOVE the way that The Judge handles the highways, steep hills, not so steep hills, and of course, the interstate. Don't laugh, but I'm running an '85 Jag XJS 2.88, 2,400 stall converter, and a 700R4 with either "stock lockup" (4th only), "old man lockup" (2,3, and 4), or teenager's lockup (none at all in any gear). And frankly, I LOVE the way she handles/drives/shifts/feels. But again, it all depends on the owner's personality whether he/she would find using such a setup and consider it "useful".....Since the 700R4 has such low 1st, 2nd, and 3rd gears (which a lot of guys don't like), it works out perfect for a low ratio rear end combination such as a 2.88 or even a 3.55...
The other thing is that the "electric speedometer" design started way back around '85, but there still were many applications that used the cable also. All anybody has to do to change any 700R4 one way or the other is to purchase whichever an owner wants/needs to make his 700R4 go either way by simply getting the "insert" that contains the driven gear/shaft which has either a cable output connector or the electric connector. Either can easily be found by googling around the interweb...
I'll shut up now...