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 Post subject: Neutral safety switch
 Post Posted: Sat Dec 20, 2014 1:31 am 
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Weekend Racer
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Location: Crestview, FL.
I'm currently swapping a 5.3/4L60E into my 79 Malibu and have come across a snag. Are you guys using the neutral safety switch that mounts on the transmission to let the PCM know when it is in park or neutral? or are you hooking up to the mechanical device on the column that allows the ignition to move only in park/neutral?

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1979 Malibu Classic 5.3/4L60E
1989 Iroc-z 5.3/MN12 6-speed transmission
1999 ECSB Z71 Silverado 5.3/4L60E


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 Post Posted: Mon Dec 22, 2014 7:43 pm 
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Location: Crestview, FL.
Ok, my car has a reverse light switch towards the bottom of the column with 2 prongs for the reverse lights:Image

And here's the replacement switch for my 79 Malibu that they sell in the parts store, it has 5 prongs.Image

The LS PCM wants to see a ground signal on pin 34 on the C1 PCM connector so that it can adjust the RPM. I'll use the contacts on this switch that are closed in Park and Neutral to do so, one prong will go straight to ground while the other prong will go to pin 34 on the C1 connector.

The neutral safety switch on the transmission will now be done away with. Wanted to utilize one on the column instead of running an extra switch I don't need on the transmission.

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1979 Malibu Classic 5.3/4L60E
1989 Iroc-z 5.3/MN12 6-speed transmission
1999 ECSB Z71 Silverado 5.3/4L60E


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 Post Posted: Mon Dec 22, 2014 8:22 pm 
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MalibuRacing Junkie
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Location: Lederach
Yes, that is the switch used on 1981 and later automatic transmission cars, with a computer. The computer needs to know when the car is in gear or not.


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 Post Posted: Sat Jan 10, 2015 10:27 am 
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what if the pcm is tuned for a manual trans? (Im running a th 400). I was going to eliminate all of the auto trans wiring from my harness.

Thanks

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 Post Posted: Sun Jan 11, 2015 9:43 am 
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MalibuRacing Junkie
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Location: Lederach
I have a manual chip in my computer. I just disconnected the plug P/N plug from the switch.


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 Post Posted: Mon Jan 12, 2015 7:53 pm 
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Location: Apopka, Florida
t5montecarlo wrote:
I have a manual chip in my computer. I just disconnected the plug P/N plug from the switch.



From the monte carlo car side (going to the column) or from the swap harness? I was just going to
take the 4L60E wires out of my harness.

Thanks for the reply.

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 Post Posted: Mon Jan 12, 2015 8:10 pm 
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MalibuRacing Junkie
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Location: Lederach
I am using the original wiring harness. I just unplugged the connector from the P/N terminals at the base of the steering column.

The TCC harness was pulled into the engine compartment and tucked between the fender and the A/C box.


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