Quote:
Originally Posted by Christ
A locked TC will not prevent the transmission from shifting. In fact, the TC has nothing to do with transmission shifts at all. All that changes when the TC locks are the relationship between the engine and input shaft, and the passage to teh trans cooler closes. The transmission will still shift at it's set points because that is based on fluid pressure, which increases with engine and vehicle speed.
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If TC was not needed for transmission operation it could be replaced with centrifugal clutch which would be locked at 10-15 km/h. When did you see something like this in car? TC is not usually locked in 1-3 gears. This helps transmission to shift. If I lock my TC at 40km/h I can feel vibrations from engine working near Idle and trying to pull the truck. This is why I set lock point @ 65 km/h.
Also I do need to turn lock off manually sometimes. Here is scenario: I slow down to 60 km/h TC is locked and will be locked until 59 km/h. Suddenly I need to speed up for whatever reason (light changes etc) if I floor my throttle the engine is at low rpm range about 1000 rpm it needs to rev-up to get more power but TC holds it. In this case I just flip the manual switch which is near by.