4 low shift signal
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Staging Lane
Joined: Jun 2013
Posts: 53
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From: Currently Warrensburg, Mo trying to move to Pottsville, PA
4 low shift signal I have been doing a lot of reading and hoping someone can help straighten this out for me. My whole drive train is GM, from the 5.3 LM7 out of a 2004 avalanche, the 4l60E transmission from a 2006 Silverado, to the NP241 out of a 90's suburban with the electronic VSS on the tail housing. I have read a lot of people using a separate VSS signal before the transfer case. If I don't have to add a whole separate VSS I would like to go that route. I had read on only about 2 forums from other sites that the transmission will shift properly if it knows it is in 4 Low, and it gets the info through the PCM from the 4 Low signal wire in the harness. Can anyone confirm this, and also that all it needs is to connect to is a ground for the signal. Would definitely save a good bit of $$$ and work if that is all it really needs.
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Joined: Dec 2014
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I have been doing a lot of reading and hoping someone can help straighten this out for me. My whole drive train is GM, from the 5.3 LM7 out of a 2004 avalanche, the 4l60E transmission from a 2006 Silverado, to the NP241 out of a 90's suburban with the electronic VSS on the tail housing. I have read a lot of people using a separate VSS signal before the transfer case. If I don't have to add a whole separate VSS I would like to go that route. I had read on only about 2 forums from other sites that the transmission will shift properly if it knows it is in 4 Low, and it gets the info through the PCM from the 4 Low signal wire in the harness. Can anyone confirm this, and also that all it needs is to connect to is a ground for the signal. Would definitely save a good bit of $$$ and work if that is all it really needs.
Thread Starter
Staging Lane
Joined: Jun 2013
Posts: 53
Likes: 0
From: Currently Warrensburg, Mo trying to move to Pottsville, PA
I haven't though I am still a bit away from finishing my wiring, and starting the engine. So I was just going to proceed with the plan that it will work and put a contact switch on the shifter I am building for 4 low to send the signal.
Staging Lane
Joined: Oct 2011
Posts: 97
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On 03-06 it is pin 16 that is the 4wd signal and it needs to be grounded. I emailed Brendan at LT1swap about this for my swap. I am using a micro switch on my 4wd shifter. You could go even simpler and just add an LED toggle switch on the dash somewhere if you wanted.
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Staging Lane
Joined: Oct 2011
Posts: 97
Likes: 0
*edit*
I was going to use the 4wd switch on my NP231 but that won't work because it grounds when you are in 4 Hi. Also I have a 2 low kit installed and it would break the ground in 2 Low so I decided on a micro switch at the shift lever.
Last edited by stomperxj; Jul 4, 2016 at 10:48 PM.
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