Torque Converter Lockup - Dodge Cummins Diesel Forum

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post #1 of 23 (permalink) Old 02-13-2009, 12:05 PM Thread Starter
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Torque Converter Lockup

What is a torque converter lockup and how do I do it?


2001 Dodge Ram 2500 2WD Auto 5.9L Cummins: Raptor 150 w/ full 1/2" line kit, DTT Sump, Hypertech 3 Stage programmer, BD Boost Fooler, blocked wastegate, BHAF, 5" RSD exhaust, ISSPRO EGT, boost and fuel pressure gauges.
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post #2 of 23 (permalink) Old 02-13-2009, 02:07 PM
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You have a lock-up style torque converter, at a certian speed it will lock up and provide direct power just like a clutch in a manual truck. The factory setting is any where between 35-45 depending on what gears you have. The shifting pattern is 1st 2nd 3rd... than lock up and then 4th. You can get aftermarket controllers to adjust the speed at which you get lock up to any speed from 18mph up.

The lock up or "mystery" switch is just a switch to ground the tq circuit to achive lock up. But in 99 or 2000 and newer it will set off a check engine light. You have to pay attention though with a switch like that cuase the trany will NOT down shift with tq locked. Also if you try to come to a stop it will kill the motor just like a manual truck not pushing in the clutch.

Send me your email and I can send you instruction on how to wire one up with out the CEL coming on.

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post #3 of 23 (permalink) Old 02-16-2009, 03:16 PM
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Quote:
Originally Posted by Nitrous340 View Post
You have a lock-up style torque converter, at a certian speed it will lock up and provide direct power just like a clutch in a manual truck. The factory setting is any where between 35-45 depending on what gears you have. The shifting pattern is 1st 2nd 3rd... than lock up and then 4th. You can get aftermarket controllers to adjust the speed at which you get lock up to any speed from 18mph up.

The lock up or "mystery" switch is just a switch to ground the tq circuit to achive lock up. But in 99 or 2000 and newer it will set off a check engine light. You have to pay attention though with a switch like that cuase the trany will NOT down shift with tq locked. Also if you try to come to a stop it will kill the motor just like a manual truck not pushing in the clutch.

Send me your email and I can send you instruction on how to wire one up with out the CEL coming on.
Ive been meaning to do this, mind sending it to me too?

afrogs19df@aol.com

thanks,
derek

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post #4 of 23 (permalink) Old 02-16-2009, 03:21 PM
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Its very hard on a stock tranny when you lug it good with the tc locked. just remember that when your blowin all that smoke

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post #5 of 23 (permalink) Old 03-13-2009, 10:32 PM
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Hey kind of interested in this,, i have an 05 auto ,, please e-mail me instructions, tweeter270@yahoo.com thank you

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post #6 of 23 (permalink) Old 03-14-2009, 12:18 AM
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Actually I did a write up here about it.

TC switch howto (with pics)
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post #7 of 23 (permalink) Old 03-14-2009, 07:09 PM
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Just installed the tc lock up switch. thought i had it installed right the first time but wouldnt do anything when i pushed the button,, so i put two 10 ohm resisters in and still nothing,, so i checked the wire i taped ,, i thought it was the right one but i guess i looked at the plug wrong.. so i read some more on this outstanding site and tapped the yellow with blue stripeand it works... just havnt got to go try it out yet... thank you guys very much for all the info

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post #8 of 23 (permalink) Old 03-17-2009, 12:25 AM
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i put a spring on the kickdown cable to pul some of the tension out of the cable and had a computer hooked up with it said i was getting more line pressure but it will change the way it shifts but holds lot better

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post #9 of 23 (permalink) Old 03-19-2009, 02:45 PM
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this post is just to BtT it .

A good friend of mine is going to need it. Thanks guys.
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post #10 of 23 (permalink) Old 03-19-2009, 02:50 PM
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Here is Nitrous340's write up guys. Someone else can toss it on bit torrent.

http://dl.getdropbox.com/u/42304/Mys...%20install.doc

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post #11 of 23 (permalink) Old 08-28-2009, 01:40 PM
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is these tc switches just for auto's
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post #12 of 23 (permalink) Old 08-28-2009, 03:06 PM
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Quote:
Originally Posted by x42vice42x View Post
is these tc switches just for auto's
Yup, unless you've got a TC in your manual somehow.
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