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The way mine works (sounds the same as the others) is that the converter locks up automatically when it shifts to 4th (OD), if I put the gear selector in 1,2,or 3, I flip the toggle switch that locks up the converter. I only shift to 3rd when I am towing my big boat to keep the revs up a bit, just works better. You may use 1st or second in a traffic jam or cruisin the strip at a rod run (but you probably dont need to lock it up then).

One time I forgot to flip the toggle towing the big boat (4000#) and the trans got hot FAST, flipped switch and it went right back to normal.

Wiring the toggle is very easy, fuse box to toggle to plug on trans.
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