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Old 02-11-2010, 07:02 PM
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350 lockup

Does anyone know if there is an aftermarket torque converter Lockup switch for a 350 TH lockup model trans?The wiring on my vehicle leaves me with tons of questions. There is a vacumn switch on the firewall just left of center facing the firewall. The plug on this switch is similar to the plug on the trans. Thanks

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Old 02-11-2010, 10:08 PM
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That Vacuum Switch supplies 12V to the Trans plug when manifold vacuum is high. At trans 12V goes to the TCC/TorqueConverterClutch solenoid to direct oil flow for TCC lockup in 3rd gear only.
You can use a toggle switch to control the TCC lockup if you want. The TCC will unlock by itself when it down shifts to 2nd or you turn it off with switch. If you forget to turn it off when braking it will feel like you're stopping a manual trans vehicle without pushing the clutch in until the trans downshifts.

Last edited by SSedan64; 02-12-2010 at 05:07 AM.
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