1QUICKHATCH Posted September 20, 2011 Report Share Posted September 20, 2011 Thinking of doing an OBD II swap on my 3500 lumina along with a 4T65E. What is the best harness to use to keep things simple, and what has every one else used? I have HP tuners that is why I am thinking OBD II! And can I get away with just the under hood harnes and running it as a standalone if this makes sense? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted September 21, 2011 Report Share Posted September 21, 2011 (edited) You'd have to find something 3x00 powered that has a 4t65e in a gen 1 wiring configuration. That would be a 00-01 Lumina only off the top of my head. Similar but likely requiring rewiring would be most any u-van with a 3400 and 4t65e Though the harness may plug in, it is not directly plug and play. You'll have to do some changes to the firewall connector, but that is not that hard to do... and probably delete the passkey code from the PCM. Edited September 21, 2011 by Crazy K Quote Link to comment Share on other sites More sharing options...
WrathOfSocrus Posted September 23, 2011 Report Share Posted September 23, 2011 I'm in the process of using a U body minivan harness to upgrade to OBD 2 in my 89 Cutlass. There doesn't seem to be a firewall connector (using a 2000 Venture harness), but rather the interior harness passes through the firewall and plugs into the fuse box with a large connector. Perhaps earlier models used the firewall connector. I would imagine a 97 W body with 4T65 would have a harness that is slightly easier to work with if you are only doing the engine harness. I'm not sure when they stopped using the firewall connector, or when they started using a BCM, but those are things to consider. In my case I had a donor vehicle and grabbed everything I could including the entire steering column and wiring from the doors forward. I took all of the things attached to the harness like the BCM, gauge cluster, and HVAC controls. Connecting the HVAC controls and wiring for the rear lights will have to be worked out and a few things like the cluster will take some modification to fit. Other than that the interior harness isn't too bad. It is definitely a lot of wiring though. I would say the new harness is easily double the weight of the one being replaced. Quote Link to comment Share on other sites More sharing options...
1QUICKHATCH Posted February 18, 2012 Author Report Share Posted February 18, 2012 I'm in the process of using a U body minivan harness to upgrade to OBD 2 in my 89 Cutlass. There doesn't seem to be a firewall connector (using a 2000 Venture harness), but rather the interior harness passes through the firewall and plugs into the fuse box with a large connector. Perhaps earlier models used the firewall connector. I would imagine a 97 W body with 4T65 would have a harness that is slightly easier to work with if you are only doing the engine harness. I'm not sure when they stopped using the firewall connector, or when they started using a BCM, but those are things to consider. In my case I had a donor vehicle and grabbed everything I could including the entire steering column and wiring from the doors forward. I took all of the things attached to the harness like the BCM, gauge cluster, and HVAC controls. Connecting the HVAC controls and wiring for the rear lights will have to be worked out and a few things like the cluster will take some modification to fit. Other than that the interior harness isn't too bad. It is definitely a lot of wiring though. I would say the new harness is easily double the weight of the one being replaced. Been thinking about the swap again... did you ever get yours done? how dose it work? I might be able to get a harness from a 2001 GAGT for next to nothing but I might just wait and grab one from a venture van:confused: Quote Link to comment Share on other sites More sharing options...
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