Thread: Torque Converter Lock/Unlock
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Old Fri, August 14th, 2009, 10:22 AM
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Jackpine Jackpine is offline
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Originally Posted by Sburn View Post
Interesting subject. Like Jack, I drive a gasser, so it's not always apples-to-apples with the diesel rigs.

But on the subject of T/C locking/unlocking, I was going though the transmission part of the factory service manual (2007 F150) one day. Ford's own transmission road test procedure suggests that the T/C should stay locked when letting off the gas above ~40MPH and unlocking only when the brakes are applied. But my truck has never done this, either when stock or w/ Gryphon. Letting off the gas unlocks the T/C, brakes or not.

From what I've read here and other places, it doesn't sound like anybody's 2004+ F150 stays locked when tipping out of the gas. So who knows what Ford was thinking...
Not trying to hijack this thread, but Sburn, have you noticed that the TC will remain locked when you're coasting downhill with the cruise control on? (At least mine does). So it attempts to hold the speed in this situation. Tap the brake (releasing the cruise control) and the TC immediately unlocks.

Wonder if the diesel strategy is the same?

- Jack