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Old 06-22-2009, 07:18 PM
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th350 lockup switch

i recently installed a th350 with a lockup torque in my 79 4x4, the truck originally didnt have a lockup. so now i gota figure out how im gunna hook up the switch. does it run off of the distributer? or shud i just run a seperate aftermarket switch that i turn on for going down the highway?

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Old 06-24-2009, 05:54 AM
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Most 80 and newer trucks had the TH350C with lockup. They used a vacuum switch on firewall which activated with high vacuum then through the Brake switch under dash to disengage lockup. You could rob the parts from a junker or just run 12V from Brake switch to toggle switch & wire to the trans switch. I recommend using a new Brake switch for an 80 up truck that has more terminals so the lockup will disengage when you try to stop.
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Old 06-27-2009, 12:30 AM
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k thanks i found the vacuam switch assembly in my buddys bone yard. is it safe to run my tranny without the lockup switch hooked up for the time being ?
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Old 06-27-2009, 02:50 AM
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It wont hurt the 350C to not have the TCC locked.
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Old 06-28-2009, 01:10 AM
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sweet. thanks alot
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