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nick
Dodge Dakota
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10/27/2004
13:41:29
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 Subject: lock up torque converter??
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Message:
is that like limited slip??
sorry, i've had a 6 speed so im not knowing about torque converters.
thanX,
nick
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Forseti
Dodge Dakota
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10/27/2004
17:01:10
| RE: lock up torque converter??
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Message:
A torque converter is used on the Automatic trans .... if you have a 6 speed ... you dont have one ... you have a clutch and pressure plate ...... as for a "lockup" converter all that means is that there is a type clutch in the converter that at certain times it locks and gives a 1to1 on engine output and trans input
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help me out
Dodge Dakota
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10/27/2004
20:29:57
| RE: lock up torque converter??
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Message:
makes for alot of heat in the trans for off road use anyhow.
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nick
Dodge Dakota
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10/28/2004
14:28:38
| RE: lock up torque converter??
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Message:
yea i know my 6 speed didnt have a converter...thats why i dont know a whole lot about them.
so u say it will give 1 to 1 output, but does that mean both tires will spin evenly like limited slip???
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GraphiteDak
GenIII
10/28/2004
15:35:53
| RE: lock up torque converter??
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Message:
OMG :-P
It has nothing to do with the rear axle or traction.
The torque converter is in the front of the transmission. Instead of having a manual clutch like a manual tranny, the torque converter uses hydrolic fluid to apply the turning mass that is bolted to the flex plate (crank of the engine) to the input shaft of the transmission. This is what allows the car to be IN GEAR at a dead stop without stalling the engine.
The converter allows some slippage and depending on "stall speed" it has a more positive transfer to the transmission at higher RPM's. Most vehicles have about a 2000 "stall speed" So if you held the brake while it was in gear and push on the gas, your tach should climb to about 2000 RPM's. Once you pass the 2000 RPMS the slippage is much less but you can feel and see it on your tach as you push on the gas or let off.
They make LOTS of heat as they slip. Actually when it's unlocked the power is sent from one part to the other via fluid with rotors etc close together (from what I know anyway). It's not a clutch or anything that is slipping. The LOCK UP does directly connect the two parts. Fluid is sent through the center port of the shaft from the transmission to engage a clutch inside the torque converter. When that happens it is dead locked where there would be no slippage at all. The heat generated is reduced.
That's about as simple as I can explain it.
On some tranny's, like the 5-45RFE, if you manually select it out of OD it will be in 3rd gear, but also keep the converter locked at a much earlier point, as well as keep it locked. This is good for towing a heavy load.
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Joe.C
Dodge Dakota
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10/28/2004
15:46:28
|  RE: lock up torque converter??
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Message:
A lock in torque converter also allows better fuel economy at Highway speeds. For instance my Automatic (42RE) when in 4th drops the RPM to about 1800 @ 55 MPH. In the converter locks in then it drops down to 1500 RPM.
You might remember seeing some of the older Ford trucks with O/D on the tailgate. That didn't make it a 4speed just a 3 speed with a lock in torque converter.
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nick
Dodge Dakota
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10/29/2004
12:38:34
| RE: lock up torque converter??
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Message:
thank you very much for the explanation.
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