Help! My thread title sucks!!!!!!!!

[CODFATHER]

Ok so i'm in the process of putting my 97 gtp front cradle, motor, trans combo into my 98 gt. Are there any differences in the wiring that I need to look out for? Im using the wiring harness and pcm from my 97 gtp but idk if they are the same or not. I'm not seeing any extra plugs on the sc3800 vs the na 3800. Any suggestions?

[blueguy]

Pretty sure if you are just swapping the harness, then everything is going to be the same...but don't quote me as I've never done a harness swap, just motor/trans swaps. Also, if you are keeping the '98 GT transmission the gearing in the '97 GTP PCM will be different so you will need the trans settings changed in the PCM via a tuner of some sorts.

[CODFATHER]

Im taking everything. My gtp cradle, trans, pcm, wiring harness, and the supercharged motor are all going into my gt. So I won't have any issues with that. Im just wanting to make sure that it will all wire up correctly to my gt and I don't have to add anything to make the gtp harness work in my gt. I know I won't have my boost gauge any more but that's ok i guess. as long as my hud works i'll be happy

[BillBoost37]

First off...Please retitle the thread to something that makes sense. Your thread titles always end with a ! and typically aren't overly descriptive. Thank you.

Your GTP cradle is the same as the GT cradle. if you swap them, and the GT one isn't rusty etc. It's just extra work with no benefit.

Wiring. Do not use the 97 harness. Use the 98 harness but add in the boost control soleniod wiring and move the map sensor connector over. Those two things will save you a lot of headaches. Then get a 98 GTP pcm or it's programming modified to work with the lack of a fuel pump speed relay etc etc. The 98 is much better and faster than the 97.

[Poil336]

the only things you add when you do a top swap are the BBV wiring and the different map sensor connector. it should go smooth. you could run an aftermarket boost gauge by putting a T on the manifold port too

edit: bill beat me to it.

also, listen to bill.

[BillBoost37]

LOL, only had you by a few seconds.

[CODFATHER]

First off...Please retitle the thread to something that makes sense. Your thread titles always end with a ! and typically aren't overly descriptive. Thank you.

Your GTP cradle is the same as the GT cradle. if you swap them, and the GT one isn't rusty etc. It's just extra work with no benefit.

Wiring. Do not use the 97 harness. Use the 98 harness but add in the boost control soleniod wiring and move the map sensor connector over. Those two things will save you a lot of headaches. Then get a 98 GTP pcm or it's programming modified to work with the lack of a fuel pump speed relay etc etc. The 98 is much better and faster than the 97.

I know the cradles are the same but for time's sake we dropped the entire cradle from both cars to save on unnecessary work. it was just easier to drop the whole thing suspension and all, and just swap them out. So basically the fuel pump is under powered in my gt and won't work the best with the gtp motor setup?

[BillBoost37]

I don't remember saying the pump wouldn't keep up. I said the pcm should be programmed for the lack of a fuel pump speed relay.

[CODFATHER]

I don't remember saying the pump wouldn't keep up. I said the pcm should be programmed for the lack of a fuel pump speed relay.

Alright sorry lol. Well if that's the case, then will the gtp at least still run when I put my gt motor, trans, cradle and pcm in ? I'm just worried that the gtp wont run and i wont be able to sell it unless i have the pcm tuned for the relay difference

[BillBoost37]

Wiring. Do not use the 97 harness. Use the 98 harness but add in the boost control soleniod wiring and move the map sensor connector over. Those two things will save you a lot of headaches. Then get a 98 GTP pcm or it's programming modified to work with the lack of a fuel pump speed relay etc etc. The 98 is much better and faster than the 97.

Further... the 97 pcm will not work with the 98 wiring and the 98 pcm won't work with the 97 wiring. Unless you repin the pcm connectors. The pinouts are different.

[Poil336]

oh man... ouch. that's like 160-some wires

[BillBoost37]

From a couple threads I found years ago..I think the W body only has about 20 wires that need to be repinned from 97 to 98. However the Bonneville... I made myself a converter from 97 pcm to 99 harness. Soldered like 120 wires.... turned the key and she fired right up. Drove to emissions with the right vin and everyone was happy. I then tossed the 99 pcm back in.

This is a very easy swap.. Not sure what you aren't understand Cod...but please ask the questions and we'll answer.

[CODFATHER]

From a couple threads I found years ago..I think the W body only has about 20 wires that need to be repinned from 97 to 98. However the Bonneville... I made myself a converter from 97 pcm to 99 harness. Soldered like 120 wires.... turned the key and she fired right up. Drove to emissions with the right vin and everyone was happy. I then tossed the 99 pcm back in.

This is a very easy swap.. Not sure what you aren't understand Cod...but please ask the questions and we'll answer.

Seriously man I appreciate the help, but all the unnecessary crap is driving me nuts. I just want my 98 gt to run with my 97 gtp drivetrain. Help me get my car running the way it should and I will be ecstatic. It needs to be done by Friday. Saturday is my brother's prom and he is planning on driving this. I have got to have it running by then

[CODFATHER]

Also, last night we came to a brick wall after realizing that the entire brake systems are different as well. The 98 gt uses the same electronic setup that the fbody's use, while the 97 gtp still uses the old setup.. ie. different plugs for the harness and everything. Also... the body harness doesn't have the same connectors going to the motor harness in both cars. They have I believe 3-4 plugs that connect the body harness to the engine harness and 2 of them are completely different. This has just become a massive pain in the azz. But we're so close to having both cars back and running that there's no quitting now. I guess I just need a fix to this problem

[BillBoost37]

You are talking about the ABS unit? 97 it's on the side of the master cylinder and if the car had traction control, there was another blob/module halfway down the firewall by the passenger strut. 98 it's a simple master cylinder with one abs unit on the driverside strut. Shouldn't be a huge problem. The only interface with the PCM that I'm aware of is the speed sensor wires from the hubs. You can simply connect the two wires on each side. Simple easy and quick.

On your mention of the "unnecessary crap", if you and I were understanding each other.... you wouldn't think it was unneeded. You'd find your questions were clearly answered in that crap.

Stated which engine harness to use
Stated how to modify it to work
Stated the difference in the vehicles that may keep your fuel pump from working.

You seem to have started a swap that isn't overly tough, without doing the research. I was trying to bring you up to speed.

[CODFATHER]

You are talking about the ABS unit? 97 it's on the side of the master cylinder and if the car had traction control, there was another blob/module halfway down the firewall by the passenger strut. 98 it's a simple master cylinder with one abs unit on the driverside strut. Shouldn't be a huge problem. The only interface with the PCM that I'm aware of is the speed sensor wires from the hubs. You can simply connect the two wires on each side. Simple easy and quick.

On your mention of the "unnecessary crap", if you and I were understanding each other.... you wouldn't think it was unneeded. You'd find your questions were clearly answered in that crap.

Stated which engine harness to use
Stated how to modify it to work
Stated the difference in the vehicles that may keep your fuel pump from working.

You seem to have started a swap that isn't overly tough, without doing the research. I was trying to bring you up to speed.

Alright that helped. Basically I keep running into issues because GM changed over a lot of things going from the 97 gtp to the 98 gt. I understand that though with the change to the 3800 in fbodys in 97 so they finally started just making everything the same in 98 between cars to make it easier on themselves and more cost effective to use the same abs units and very similar harnesses. My biggest stumping point though, is the abs/ break system hookups are different, and that the body harness to engine harness plugs are different. My friend's mom works at delphi and can get the plugs for extremely cheap but i guess my question is, will everything still work? ie dash gauges, etc

[BillBoost37]

What body to engine harness plugs are you talking about? The ABS should be on the body, attached to a body harness that has really no direct connection to an engine harness that I'm aware of.

[EJOUIE]

[xxxcritterxxx]

im running in to the same problem with plugs my 97 gt had the vac controlled trans and went with a 98 sc regal gs motor with elec controlled trans so got harness from 98 gtp but the plugs that runs through dash that controls trans is different so back to junk yard grab dash harness so got controls for tranny now but body plug is diffrent also. square plug by fuse block ties back half car together. any one have a pin out for that? got a chilton book doesnt show much. didnt think much about it at time but the gtp heater controls different also maybe dual climate control? also was for a 4 door car but only gtp they had and guy told me it would work ok. they did have one 2 door car so maybe a trip back to check out that dash harness but not sure if it had heads up display. all this work and never even heard motor run got to get pcm flashed yet. whats the better pcm to flash the 97 gt our the 98 regal the 97 has the box on top with torx head screws. no pcm from donor car already looked... thanks guys im sure should have started own post but figured since this one related be ok plus seems to be done anyway

[xxxcritterxxx]

r is it a major job to to take trans controls out of dash wire harness then just use my old one harness just not sure how all that ties in any help would be great