Thread: 700R4 "Lock up" Torque converter

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Are you guys saying that the electrical lock up switch is completely manual? I would have to lock and unlock the TC myself, sounds like a pain. This is why I was leaning toward the hydraulically (sp?) controlled unit.

Nope, that's not what I'm saying. The switch is optional, and only necessary if you want to lock up the converter in 2nd or 3rd gear. When you put on the brake, the converter unlocks.

Don,

I don't know how to answer your question. I've studied how my setup will work, and never considered a hydraulic converter. I have the electronic controlled version in my Vette (stock), so I stuck with what I knew. The 700R4 in my Vette is not really a computer controlled transmission. It's a standard automatic with an electrical lockup. The pure computer controlled version is the 4L60E. The R4 in my Vette has 120K miles on it, and it still works fine.

Oh, and the electric speedometer I have doesn't care much about gears. There's a calibration sequence that you set while driving.

ok first of all a 700r4 uses 2nd gear oil to lock-up the converter you can run power and ground to the tcc solonoid and it will not lock-up the converter at as stop because you don't have 2nd gear passages pressuresized no need for brake switch . I use the 4th gear switch which comes in the trans to lock-up the converter. one wire no kit no brake switch no toggle switch to forget and smoke the trans there is a reason you call it an atomatic.200r4 125 3254l and 350c trans can lock up the converter in 1st not a 700r4 Next stall speed has nothing to do with cruseing down the hiway a 70 the converter is locked up no slip at all.