1995 C2500 ls1 swap

[Mickeymotormount]

I actually wanted to use the '99 cruise module. I took it from the donor truck but it was defective. After multiple attempts to wire it and not have it work, I figured I'd try the '93 module originally equipped with the truck. It ended up my original wiring was correct and made the '93 module work like a charm. What I can do is pull out my '99 service manual, scan the cruise control schematic, and then post it here. Hopefully this will help you. It has been about 3 years since I swapped engines so things are a little fuzzy.

The reason the PCM is involved with the cruise in the first place is that while in cruise, the PCM alters shift patterns so there is seamless performance while in cruise control. If you have 4 wheel drive, there is also a 4 wheel enable wire that lets the PCM know when the transfer case is in Low gear. This allows the PCM to shift the trans while the transfer case is in low gear. Originally, I left this wire unconnected, later to find out that, while in the transfer case was in low range, the transmission would not shift out of 1st gear. Hooking up this wire to the transfer case low switch allowed the PCM to shift the trans while in Low gear range.

[Jeebalow]

I actually wanted to use the '99 cruise module. I took it from the donor truck but it was defective. After multiple attempts to wire it and not have it work, I figured I'd try the '93 module originally equipped with the truck. It ended up my original wiring was correct and made the '93 module work like a charm. What I can do is pull out my '99 service manual, scan the cruise control schematic, and then post it here. Hopefully this will help you. It has been about 3 years since I swapped engines so things are a little fuzzy.

The reason the PCM is involved with the cruise in the first place is that while in cruise, the PCM alters shift patterns so there is seamless performance while in cruise control. If you have 4 wheel drive, there is also a 4 wheel enable wire that lets the PCM know when the transfer case is in Low gear. This allows the PCM to shift the trans while the transfer case is in low gear. Originally, I left this wire unconnected, later to find out that, while in the transfer case was in low range, the transmission would not shift out of 1st gear. Hooking up this wire to the transfer case low switch allowed the PCM to shift the trans while in Low gear range.

Oh I see. I have a manual trans so I ended up just removing all of the transmission wiring from the LS harness. I will be using the 95 cruise module. I'll report back on whether what I did works or not. It would be nice if the electrical diagrams also included the type of signal that each wire had. It would make this much easier.

Sorry for the thread jack OP

[GreyChevy]

Does your nv4500 have the exterior slave or interior slave? Also do you happen to know the 1st and reverse gear ratio? I was going to stick with the exterior slave when I bought my nv4500 but would rather have a 5.61 reverse ratio than a 6.34.

[chvy=power]

Yea mine has the external slave...not sure of the actual gear ratio. I know it has one hell granny gear tho.

Finally got my heads back from TEA and started assembling! After a long weekend she runs! It still is a long way from being done, but I couldnt resist hearing it run. First start up, open headers- http://youtu.be/VlzXut3D6YU

[GreyChevy]

Damn that sounds good!

Is the reverse gear too low? That's my only concern because reverse is supposed to be the same ratio as 1st/granny and 6.34 is really low.

[chvy=power]

It's been a while since Iv driven it, but I don't remember reverse being too low. 1st was so low that I hardly ever used it unless I was towing

[chvy=power]

Got the exhaust fabbed up using the exhaust that was on the truck and a few other pieces Layin around. 3" Into a 3" x-pipe, dual 3" magnaflows.