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Great explanation Dan <img src="/forums/images/graemlins/kewl.gif" alt="" />, that helps a lot!

Regarding the lock-up - is this a function of the trans or TC? It sounds like the lock-up would be activated by the trans, and would need to be connected to a lock-up enabled TC?


Lock-up is a TC and trans function. There is a clutch inside the TC that locks the two halves together. It is electrically engaged (via a solenoid in the tranny), but hydraulics is what powers the clutch. So to turn it on, you need a brain that turns the solenoid on (you, if you're going with pure manual), and you need to be in a gear that the tranny will send hyraulic fluid to the clutch.

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Hypothetically <img src="/forums/images/graemlins/rolleyes.gif" alt="" />, if one were to forget to turn off the manual lock-up when decelerating from highway speed, would the engine just stall out?


Probably not. Like I mentioned, I think most trannys will *not* power the clutch in first gear even if the solenoid is on. The hydro fluid is not routed to it in this gear. Depends entirely on the tranny though. Also, the TC clutch is not exactly a high performance clutch. It will stay locked at cruise and maybe braking down a hill, but under full power, or braked at a stop it may slip rather than kill the motor. Again, it depends on the tranny, TC and motor.

--Dan