T/C lockup conclusion (mine at least) - Ford Powerstroke Diesel Forum
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Old 05-04-2009, 07:05 PM

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T/C lockup conclusion (mine at least)

so I wired in the DPDT, two LED T/C lock up switch today. I wanted to have more reliability/control when pulling my camper this summer. Here is what I noted: TC stays unlocked until 37mph then it locks. I started on a flat 55mph hiway, TC stayed locked in the whole time after 37mph. Started up the mountain, steep grade hill my converter stayed engaged while automaticaly down, and upshifting. I am basing this on the green led incircuit with the ECM, wich should light up when comp. is telling TC to lockup. I played several times with turning on the lockup manually and noticed no diff in behavior. I came to a stop on a pullout to make sure my switch worked and the TC was locking in,.............it is, it started acting as though I was lugging a stick, as soon as I turned the switch off it smoothed out, so that works. Coming down the mountain the TC stayed locked in all of the time, even when I was applying brake, until I slowed below 39mph then it unlocked. So is this a "special truck" or is anyone else coming to the same conclusion, cause this is way different than what I have been reading, and now I don't see a reason to have it, it automaticaly does what the switch manually does, so why a switch anyone got some comparison??
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