VSS wire splicing
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
So it might not be factory
Now its packing a 1995 4.3L / 4l60e. Fit like a glove..well except the air cleaner. I`m still working on that part. The hood kinda bends over it. Theres pics on my f-quick\/ \/
Now its packing a 1995 4.3L / 4l60e. Fit like a glove..well except the air cleaner. I`m still working on that part. The hood kinda bends over it. Theres pics on my f-quick\/ \/ 
Thread Starter
TECH Addict
iTrader: (5)
Joined: Apr 2003
Posts: 2,010
Likes: 1
From: Willows, California
I think I see a solution here, but let me try to figure out exactly what you are doing here.
1. You ahve a LSx motor and PCM?
2. You have a 4l80e....is that a LSx 4l80e and your trying to control it with the LSx PCM or are you also keeping your computer from the old motor to run the trans?
You are looking for a 2000PPM signal for cruise and a 4000ppm for the speedo, is there anything else you are trying to get a signal too??
1. You ahve a LSx motor and PCM?
2. You have a 4l80e....is that a LSx 4l80e and your trying to control it with the LSx PCM or are you also keeping your computer from the old motor to run the trans?
You are looking for a 2000PPM signal for cruise and a 4000ppm for the speedo, is there anything else you are trying to get a signal too??
I'm ditching the old computer and using the new Vortec 454 computer to run the engine and transmission. All I'm wanting to send the signal to is the PCM, Speedo and Cruise Control.The DRAC is built into the cluster from 88-90,(91?) The couple of older fullsize trucks that I have done the retrofit in I left the cluster controlling the cruise. Then spliced the high and low speed sensor output heading to cluster direcly to the VSS wiring heading to the new LSX pcm. Neither will ever know they are piggy backed with anything else. The trans shifted correctly, and the vss and cruise functioned perfectly and it did not need adaptors and was pretty straight forward.
The DRAC is built into the cluster from 88-90,(91?) The couple of older fullsize trucks that I have done the retrofit in I left the cluster controlling the cruise. Then spliced the high and low speed sensor output heading to cluster direcly to the VSS wiring heading to the new LSX pcm. Neither will ever know they are piggy backed with anything else. The trans shifted correctly, and the vss and cruise functioned perfectly and it did not need adaptors and was pretty straight forward.
the speedo is looking for a 4k ppm, not 40k ppm that the LSx PCM is looking for.
Reading that diagram, it looks like the speedo and cruise both use a 4k input, which would make life easy. I wonder if I can use that cruise control 'brain' in my thirdgen. It would make life a lot easier for me!
btw, you don't need a dakota box. The PCM's speedo output is 4k, just not sure where to find the other signal from
-jason
