Wiring and Standalone ECM/PCM
Staging Lane
Joined: Sep 2018
Posts: 70
Likes: 0
Just a heads up, if you're running the e78 ecm make sure either your "starter enable relay control" wire from the ecm is either hooked to a ground or make sure your starter diagnostics are turned off in your tune. If not, your injectors will not pulse no matter what you do.
Staging Lane
Joined: Sep 2018
Posts: 70
Likes: 0
I did this exact same swap in my 87 v10. The 4x4 version. I also kept my saddle tanks. When I get back home I'm going to go through my wiring diagram and mark what all wires I removed from the ecm. I also reused the factory fuse box from the van I got it out of. I'll also take a look st the factory bulkhead for our trucks and try and get a pinout on those. I have everything working and the truck is driving but getting it tuned is a big headache.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
Thread Starter
Teching In
Joined: Nov 2018
Posts: 12
Likes: 0
Thread Starter
Teching In
Joined: Nov 2018
Posts: 12
Likes: 0
I did this exact same swap in my 87 v10. The 4x4 version. I also kept my saddle tanks. When I get back home I'm going to go through my wiring diagram and mark what all wires I removed from the ecm. I also reused the factory fuse box from the van I got it out of. I'll also take a look st the factory bulkhead for our trucks and try and get a pinout on those. I have everything working and the truck is driving but getting it tuned is a big headache.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
Thread Starter
Teching In
Joined: Nov 2018
Posts: 12
Likes: 0
I did this exact same swap in my 87 v10. The 4x4 version. I also kept my saddle tanks. When I get back home I'm going to go through my wiring diagram and mark what all wires I removed from the ecm. I also reused the factory fuse box from the van I got it out of. I'll also take a look st the factory bulkhead for our trucks and try and get a pinout on those. I have everything working and the truck is driving but getting it tuned is a big headache.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
The transmission is a 6l90 if it came with a l96 6.0. These have a 36 spline output shaft. I took mine out and had it cut it down and resplined, by moser engineering, it to a 32 spline input shaft on my np208. So, either you'll have to cut down and respline yours or just get a driveshaft for it.
For a pinout diagram look at gmupfitter.com . That's how I got my pinout.
Staging Lane
Joined: Sep 2018
Posts: 70
Likes: 0
Nice. I'll look at your reference for the pinout. I think that I might do my own fuse box, just because it's easier for me to wire in new pumps by just adding a relay to what I have in mind. As far as driveshafts go, I think I might get a one piece from a 2500 silverado with the 6l90 and get it cut and have the 1350 ujoint socket get put at the rear end of the shaft. I got the parts and labor quoted at about 90$ plus the 75$ for the driveshaft itself rather than the 300$ plus for a custom shaft. I have the 2wd, so it's a little easier. No transfer case or extra driveshafts to worry about. It's actually a really good learning experience for my first project.
Thread Starter
Teching In
Joined: Nov 2018
Posts: 12
Likes: 0
Just a heads up, if you're running the e78 ecm make sure either your "starter enable relay control" wire from the ecm is either hooked to a ground or make sure your starter diagnostics are turned off in your tune. If not, your injectors will not pulse no matter what you do.
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Verdad Gallardo Staging Lane
Joined: Sep 2018
Posts: 70
Likes: 0
No problem bud. Now wiring up the tcc I cannot remember exactly how I done this right now but its backwards from what you would think. I believe it grounds when the brake is pressed and I had to use a relay or something. I'll look at it some more when I get back home.