Torq Converter lock up - Ford Powerstroke Diesel Forum
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Old 03-10-2014, 12:40 AM
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Torq Converter lock up

First off let me start by saying as far as I know I have no issues with my 5R110. Now, every so often I come across posts (a lot actually) when people are talking about their transmission issues they talk about the torq converter being 'locked up' and also some talk about it being 'unlocked' they speak of this as though they themselves are manually doing the 'locking' and 'unlocking'??? Now I have an 07 F350 with the 5R110 and I have no idea how to 'lockup' or 'unlock' my TC other than shifting into a go gear(lockin' it up) or back into park( unlockin' it) or when traveling, lifting my foot off of the throttle so what exactly are these people doing differently than I am? or what in the name of *(&% are they talking about? Thanks for any and all input.
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Old 03-10-2014, 08:09 PM
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To understand "lock up" you need to understand what a torque converter does.

The torque converter transmits and multiplies torque. The torque converter is a device which includes four elements:

The impeller assembly

The turbine assembly

The reactor assembly

The clutch and damper assembly

The standard torque converter components operate as follows:

Rotation of the converter housing and impeller set the fluid in motion.

The turbine reacts to the fluid motion from the impeller, transferring rotation to the
geartrain through the input shaft.

The reactor redirects fluid going back into the impeller, providing for torque multiplication.

The clutch and damper assembly dampens powertrain torsional vibration and provides a direct mechanical connection for improved efficiency.

Power is transmitted from the torque converter to the planetary gearsets and other components through the input shaft.

Basically, the "lock up" they refer to is the clutch in the torque converter locking when no more "slip" is desired, and in effect the torque converter becomes just like a clutch in manual transmission. In stock form you cannot control torque converter lock up.

Last edited by Awtblo; 03-10-2014 at 08:23 PM.
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Old 03-11-2014, 01:52 AM
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Quote:
Originally Posted by Awtblo View Post
To understand "lock up" you need to understand what a torque converter does.

The torque converter transmits and multiplies torque. The torque converter is a device which includes four elements:

The impeller assembly

The turbine assembly

The reactor assembly

The clutch and damper assembly

The standard torque converter components operate as follows:

Rotation of the converter housing and impeller set the fluid in motion.

The turbine reacts to the fluid motion from the impeller, transferring rotation to the
geartrain through the input shaft.

The reactor redirects fluid going back into the impeller, providing for torque multiplication.

The clutch and damper assembly dampens powertrain torsional vibration and provides a direct mechanical connection for improved efficiency.

Power is transmitted from the torque converter to the planetary gearsets and other components through the input shaft.

Basically, the "lock up" they refer to is the clutch in the torque converter locking when no more "slip" is desired, and in effect the torque converter becomes just like a clutch in manual transmission. In stock form you cannot control torque converter lock up.
Thanks you for the reply it answered my question.
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