LS to 2004R

ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
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New Mexico
Question for the clever people. If I have a perfectly good 200-4R but decide to go the LS route, is there a known hack to use the ECU to apply TCC lock? The internal program is guaranteed to be wrong, and some wire splicing must happen. The other option is a standalone controller.
 
motorheadmike

motorheadmike

Comic Book Super Hero
Nov 18, 2009
4,124
113
Ottawa, Ontario Canada
Guess who hasn't tried this yet?

<= THIS GUY!

First you need to choose "transmission non-electric". That said, it may need a PRNDL or P/N switch to allow it to activate. One of the reasons why I added a VSS was to see if the TCC can still be triggered by the PCM since it looks for road speed for engagement in 2-4. Additionally, certain codes may have to be turned off to avoid setting the CEL. Lastly, the TCC in the 4L60E should work on the same type of circuit as the 200-4R - but if it is inverted a relay can be used to swap the command from 12v to ground.

Yeah, I need to get back to work on the Monte.
 
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ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
3,822
113
New Mexico
So it's as simple as picking off a switched circuit based on speed? What about engine load - kickdown from a higher gear...I should know this, but I'm not sure the old school transmissions make this choice mechanically.
 
motorheadmike

motorheadmike

Comic Book Super Hero
Nov 18, 2009
4,124
113
Ottawa, Ontario Canada
So it's as simple as picking off a switched circuit based on speed? What about engine load - kickdown from a higher gear...I should know this, but I'm not sure the old school transmissions make this choice mechanically.
That's the rub. Electronic controls do lots of stuff vacuum used to. I'd suggest a factory carb vacuum switch could be put inline to interrupt the circuit under low vac/boost scenarios... which is great until you want it to lock-up under load.

I have only notionally looked into how to make this function "properly".
 
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T

Tony1968

Master Mechanic
Supporting Member
Jul 1, 2018
346
63
NW Indiana
Guess who hasn't tried this yet?

<= THIS GUY!

First you need to choose "transmission non-electric". That said, it may need a PRNDL or P/N switch to allow it to activate. One of the reasons why I added a VSS was to see if the TCC can still be triggered by the PCM since it looks for road speed for engagement in 2-4. Additionally, certain codes may have to be turned off to avoid setting the CEL. Lastly, the TCC in the 4L60E should work on the same type of circuit as the 200-4R - but if it is inverted a relay can be used to swap the command from 12v to ground.

Yeah, I need to get back to work on the Monte.
Where in the H E double hockey stick do you get all this knowledge from?
 
motorheadmike

motorheadmike

Comic Book Super Hero
Nov 18, 2009
4,124
113
Ottawa, Ontario Canada
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