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Old 08-29-2003, 07:49 PM
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transmission

i just swaped in a 307ci olds eng and th200c into my 1980 cutlass.the tranny i took out had a two prong plug by the shifter the 200 has a four prong plug.i was woundering what the other two prongs were for and if it has any thing to do with the tranny operation ? the eng and tranny are from a 1986 cutlass.
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Old 08-31-2003, 04:08 AM
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the plugs are for the lock up torque converter. the computer sends a signal to the tranny for lock up operation. if your not using the computer, then the tranny doesn`t know to lock up. you can run it without the lock up functional, but I would add a external tranny cooler to keep the temps under control, or you can go to the junkyard or the donor vehicle and get the plug from it that matches the one your about to use, and run it to a toggle switch, the front terminal on the outside of the plug if memorey serves me correctly is the ground and the rear is the power, lock up is only needed in 3rd gear at cruise, if you run it to a toggle switch flick the switch before you stop the vehicle or you could wire it to the brake pedal switch which still should be present on your vehicle. lock up converters are designed to eliminate slippage in the converter, it drops the cruise RPM by about 200.
Even if you plan to use the lock up, it`s still a wise idea to use a external tranny cooler, as the number 1 cause of automatic transmission failure is heat.
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