94 Lifted Silverado 6.0/4L80e swap Build

Some updates...Been driving the truck up and down the road alot. Shifts better and better each time, I think it wasn't shifting good before because I did a fluid flush and it prob takes some time for all the fluid to work itself back into the valleys and grooves. I bought a autometer triple pillar pod for a temp gauge, oil pressure gauge, and air to fuel ratio. I will let you all know that it fit like a peice of CRAP. If you are going to buy one, and your are like me who is really picky and like a nice clean look to things, DO NOT BUY IT. I had to hack mine all up just to get it to fit. I will probably end up writing autometer because its a shame. One the good side, I did end up making it fit so its in its 95% stock location. The 2 main problems is it was hitting the windsheild, so you couldnt get it to clip into your a-pillar, and the bottom edge was too long by about a half inch (the edge thats near the speaker on the dash). Good thing i am a collision tech or I would have gave up on this stupid 60 dollar part. Ended up trimming it and grinding the edges down so I was able to clip it back in. Another bad thing: The black color. They dont make them in interior colors so i will probably end up getting some blue interior paint from LMC and spray it quick.

im still having shifting problems. right now i have the purple and green wire hooked up to the back of the transfer case then to the ls pcm. my speedo works but its not shifting. also where did you put the yellow/black/grey/white wire from the pns switch?

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Originally Posted by myzterray

im still having shifting problems. right now i have the purple and green wire hooked up to the back of the transfer case then to the ls pcm. my speedo works but its not shifting. also where did you put the yellow/black/grey/white wire from the pns switch?

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I will have to get u a pic for the rear vss. I don't have my pns switch wired up bc my truck is a 94. Is ur 4wd working? I can explain how I did my rear vss on the tcase but I think pics will b better. I cut nelsons rear vss connector and cut my obs connector . I took nelsons purple wires and put it with my blue wires I think from the obs. Then I took nelsons green wire and put it with the obs green I think. Then I put the stock obs connector on. So u will have two wires goin through a butt connector to one wire and then two. Wires goin through a butt connector to one then the obs connector

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Originally Posted by HPICamaroSS

I will have to get u a pic for the rear vss. I don't have my pns switch wired up bc my truck is a 94. Is ur 4wd working? I can explain how I did my rear vss on the tcase but I think pics will b better. I cut nelsons rear vss connector and cut my obs connector . I took nelsons purple wires and put it with my blue wires I think from the obs. Then I took nelsons green wire and put it with the obs green I think. Then I put the stock obs connector on. So u will have two wires goin through a butt connector to one wire and then two. Wires goin through a butt connector to one then the obs connector

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my 4wd wont work because i cut off the plugs that connect to the front driveshaft accidentally.

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Originally Posted by myzterray

my 4wd wont work because i cut off the plugs that connect to the front driveshaft accidentally.

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K heres 2 pics of how I did mine. The blue and purple wires in the nice clean wire loom is the LS rear vss wires. Then the dirty wire loom is my stock wires with green and blue I believe. Don't mind the red wires, those are for my neons. I have a question for you, what OBS wire(s) did you hook your LS speedo wire to?

Got exhaust ran today! And driving it to the shop I had a few problems (including blowing the water pump).

Hopefully I can get a few answers for my problems:

First, when the truck has been driven for a while and is up to temperature, i come to a stop sign and it will want to keep going and if i press the brake to try to stop it it will act like its going to stall out. So I have to put it in neutral. But when its cold i can stop and it will idle just fine with me on the brake.

Second, I cant get my speedo to work. I have tried hooking nelsons green speedo wire to my Light Blue w/ white stripe wire and nothing happens.

Third, my RPMS are way off. The tach is reading 1,000 when I am going 55 (using gps). Keep in mind I have 4.56 gears lol so I know that isn't right.

4th, when trying to confirm the RPMS with a scan tool hooked up to nelsonss obdII port, it says it can not communicate with the ecm. And the check engine light thats on their obd connector is lit up so I know it has power.


Other than those issues and the water pump, the truck drives like a dream. seems so smooth and takes absolutley no effort for it to take off. pulls really good on the top end for sure. its way stronger than my last cammed out crate motor. Ill get pics of the exhaust job, it looks really good i'd say we did a pretty good job going from the headers to a y merge pipe to a electric cut out to a single in flowmaster to dual out.

don't know how much help i can actually be since you have a 94, but on my 96 i have 2 wires coming from the c100 connector that both said vehicle speed signal, B5 & D4. one is green & the other green w/ white. the speedo wire coming off my nelson harness is green w/ white so i connected to my green/white & no speedo. connected it to the solid green, which is B5 & now my speedo works.

on the tach mine is doing about the same. it doesn't move till i hit about 3k RPM, then it only reads 1K. i saw myzterray used a 680 ohm resistor. i found 680k ohm & 680 ohm so i'm assuming it's just the 680 ohm. i'm going to hit up radio shack & see if i can get one & what happens.

i had a friend of mine come over with 2 scan tools. one really nice windows base & it worked fine. he also had a Mac & the Mac wouldn't communicate with it. i rented a code reader/scan tool from autozone this morning & it read just fine. the Mac tool also wouldn't communicate with another friend of mines harness.

hope you get your problems fixed. to me, all the final small things are harder to solve then getting the motor in everything mounted. all i have left on mine is the tach & all my factory gauges will be working, including the SES light.

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Originally Posted by HPICamaroSS

First, when the truck has been driven for a while and is up to temperature, i come to a stop sign and it will want to keep going and if i press the brake to try to stop it it will act like its going to stall out. So I have to put it in neutral. But when its cold i can stop and it will idle just fine with me on the brake.

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Did you wire the brake switch signal to the pcm...? The PCM need a 12 v when the brake are not being applied (the opposite of a standard brake light switch) This signal control the torque converter lockup.

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Originally Posted by HPICamaroSS

K heres 2 pics of how I did mine. The blue and purple wires in the nice clean wire loom is the LS rear vss wires. Then the dirty wire loom is my stock wires with green and blue I believe. Don't mind the red wires, those are for my neons. I have a question for you, what OBS wire(s) did you hook your LS speedo wire to?

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dont think it hooked up to anything honestly. once i plugged u th vss to the back of the transfercase the speedo worked. but its not smooth. its choppy kinda. i still cant get this thing to shift...i hooked up the trans range signal wire abcd now my gear indicator is acting weird.

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Originally Posted by bobbylog

Did you wire the brake switch signal to the pcm...? The PCM need a 12 v when the brake are not being applied (the opposite of a standard brake light switch) This signal control the torque converter lockup.

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How do I do that? I'm sure thats the problem because I havent done that lol