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Old 01-23-2010, 12:52 PM
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80's trans swap

I am putting a 80's computer controlled 350 trans in a 70's non computer truck. What do i do for the conversion? I assume the computer controls the shift points. And the 70's was controlled by vacuum! Right or wrong? Thanks wayne :

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Old 01-23-2010, 02:52 PM
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THM 350 trans

A THM 350 transmission is not computer controled.
The only thing on a 350 that is electriacaly controked is the computer clutch.
12 volts to the solenoid socks up the converter.
You can run + 12 volts to one wire of the selonoid and run the - wire to the 3rd gear pressure switch.
You will have lock up just after the 2-3 shift.
Good luck
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