GMT400 Wiring Questions
Thread Starter
Teching In
Joined: Oct 2004
Posts: 8
Likes: 0
GMT400 Wiring Questions All, Im looking for some help. Ive been at this swap for some months now, and now that the snow is about to fall, Ive got to get it done NOW. I'm doing a LM7 swap into a Suburban that already had a NV4500 swapped in place of the 4L60E. Ive gotten the LS harness squared away (as far as removing things per lt1swap.com) so now I'm at the point where I need to integrate parts of the LS harness into the Suburbans stock harness. I believe the VSS needs to be spliced into the Suburbans C100 E6&7, but I'm not sure. There's other circuits that need splicing, but I just need clarification of what needs to be added where.
I've searched high and low during the last seven months of this project and have found some great projects (Jeebalow, Green95Hoe, amongst many others) and some great written info (S&P's 13pg PDF), hell not to mention Brendan's amazing write up on lt1swap.com. With all of that great info, wiring the two harnesses has been glossed over for whatever reason(s). But that's ok, I guess with whoevers help I will fill in the blanks.
Ive posted this question on many of those fullsize sites, and not one person has the answer for me. Not one reply. So I heard this place has answers, I thought Id try here.
Thanks in advance.
Nick
I've searched high and low during the last seven months of this project and have found some great projects (Jeebalow, Green95Hoe, amongst many others) and some great written info (S&P's 13pg PDF), hell not to mention Brendan's amazing write up on lt1swap.com. With all of that great info, wiring the two harnesses has been glossed over for whatever reason(s). But that's ok, I guess with whoevers help I will fill in the blanks.
Ive posted this question on many of those fullsize sites, and not one person has the answer for me. Not one reply. So I heard this place has answers, I thought Id try here.
Thanks in advance.
Nick
On The Tree
Joined: May 2015
Posts: 122
Likes: 14
I will reply, but I'm dumb as a stump. Lol I am putting a l83 in a 89 silverado so I am in the same boat as you. I believe most of the wiring is straight forward, ignition, starter wires, etc. I saved the old harness so I can keep the temp and oil pressure sensors. And the wiring to the a/c compressor. The one thing I am worried about is the anti lock brakes. Not sure if you need to keep the old computer to control them.
Thread Starter
Teching In
Joined: Oct 2004
Posts: 8
Likes: 0
I will reply, but I'm dumb as a stump. Lol I am putting a l83 in a 89 silverado so I am in the same boat as you. I believe most of the wiring is straight forward, ignition, starter wires, etc. I saved the old harness so I can keep the temp and oil pressure sensors. And the wiring to the a/c compressor. The one thing I am worried about is the anti lock brakes. Not sure if you need to keep the old computer to control them.
As far as the ABS goes, I'm pretty sure it has its own computer. But that's exactly the info I need too.
Good luck with your swap. I appreciate you chiming in.
Nick
Thread Starter
Teching In
Joined: Oct 2004
Posts: 8
Likes: 0
I will reply, but I'm dumb as a stump. Lol I am putting a l83 in a 89 silverado so I am in the same boat as you. I believe most of the wiring is straight forward, ignition, starter wires, etc. I saved the old harness so I can keep the temp and oil pressure sensors. And the wiring to the a/c compressor. The one thing I am worried about is the anti lock brakes. Not sure if you need to keep the old computer to control them.
http://www.gmt400.com/forum/showthread.php?t=31954
Nick
On The Tree
Joined: May 2015
Posts: 122
Likes: 14
Thanks Suburban,
I will definitely follow this guy. I am getting started on mine now. The old drivetrain is gone and I am starting to strip the wiring from the l83. After a lot of research I believe I am removing the antilock brakes. They are said to give a lot of problems in my year truck, so I dont need the old computer.
I will definitely follow this guy. I am getting started on mine now. The old drivetrain is gone and I am starting to strip the wiring from the l83. After a lot of research I believe I am removing the antilock brakes. They are said to give a lot of problems in my year truck, so I dont need the old computer.
Thread Starter
Teching In
Joined: Oct 2004
Posts: 8
Likes: 0
Thanks Suburban,
I will definitely follow this guy. I am getting started on mine now. The old drivetrain is gone and I am starting to strip the wiring from the l83. After a lot of research I believe I am removing the antilock brakes. They are said to give a lot of problems in my year truck, so I dont need the old computer.
I will definitely follow this guy. I am getting started on mine now. The old drivetrain is gone and I am starting to strip the wiring from the l83. After a lot of research I believe I am removing the antilock brakes. They are said to give a lot of problems in my year truck, so I dont need the old computer.
Again, best of luck!
Thread Starter
Teching In
Joined: Oct 2004
Posts: 8
Likes: 0
Still Need LS Swap Harness Help I havent been able to work on the project much, but now I kinda have to since winter is on its way.
I just have some questions regarding where some wires go that are connected to the '95 C100 connector.
Any help would be appreciated.
I just have some questions regarding where some wires go that are connected to the '95 C100 connector.
Any help would be appreciated.
